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ISTMALL · SAMDUCKSA RHYTHM BUTTON
CWB 405
Samducksa Rhythm Game Button
Decades of arcade experience.
A familiar choice for your controller.
Meet the CWB 405 rectangular button from Korean brand Samducksa.
Start at an affordable price and fine-tune your setup to find the feel that suits you.
New 30g spring preinstalled · Gersung microswitch included
Six colors · Threaded nut mounting
Six colors · Threaded nut mounting
Three Things to Check Before You Order
Included Parts — Button body, cover, mounting nut, switch holder, and Gersung microswitch.
Preinstalled Spring — Fitted with Samducksa’s new 30g spring.
Lighting and Assembly — An LED lamp is not included. Insert the holder at an angle, then rotate it to lock it in place.
01 · CWB 405
Samducksa: A Korean Arcade Parts Manufacturer
Discover the manufacturing history and real-world uses behind the brand.
1983
Samducksa Is Founded
An established name in Korea’s arcade industry, Samducksa has been manufacturing game machine parts in Korea for over 40 years.
1987
Button and Joystick Production
Full-scale production and sales of arcade parts began, including levers, buttons, lamps, joysticks, and coin mechanisms.
CWB 405
From Arcades to Custom Controllers
The CWB series comes from Samducksa, also known as Crown.
The CWB 405 is an excellent choice for arcade machines and a wide range of DIY controllers.
The CWB 405 is a practical option for beginners seeking a more affordable alternative to the Sanwa OBSA-45UK, as well as builders equipping a controller with multiple buttons. Button feel and satisfaction depend on the spring, switch, panel construction, and personal preference.
02 · CWB 405
User Reviews and International DIY Projects
Explore real examples to help you choose the right button for your setup.
Korea · Rhythm Game Gallery
Durability, Value, and a Familiar Feel
Users who purchased IST, Samducksa, and Sanwa buttons highlighted the CWB 405’s durability, price, and ease of tuning. Its compatibility with various springs and familiar button feel have received positive feedback.
International · Reddit r/bemani
A Good Button at a Sensible Price
In Reddit discussions about buying buttons, many users report being satisfied with Samducksa buttons. The price difference compared with Sanwa is also a significant factor in their purchasing decisions.
International · GitHub DIY Project · Parts List
Selected for an IIDX Controller Build
A Raspberry Pi Pico-based IIDX DIY project lists seven CWB 405 buttons for its main keys. It is an example of the CWB 405 being considered for controller builds where cost matters.
03 · CWB 405
Six Colors for Your Controller
White · Black · Red · Blue · Green · Yellow
White
Black
Red
Blue
Green
Yellow
Actual colors may vary depending on your display and lighting conditions. The colors shown in the photos do not guarantee a particular illuminated appearance. An LED lamp is not included.
04 · CWB 405
Included Parts and How They Arrive
The following components are supplied with each button.
The parts are shown separately for identification. As supplied, the cover is fitted to the button body and the microswitch is fitted to the switch holder.
| Button Body | CWB 405 button body in your selected color |
|---|---|
| Preinstalled Spring | Samducksa’s new 30g spring — installed inside the button body |
| Button Cover | Black cover that fits onto the button body |
| Mounting Nut | Supplied fitted to the button body |
| Switch Holder | Supplied with the microswitch already fitted |
| Microswitch | One Gersung V-0303A06, fitted to the holder |
| LED Lamp | Not included. |
Button Cover
The cover fits onto the back of the button body.
Threaded Mounting Nut
A threaded nut secures the button body from underneath the panel.
Switch Holder + Microswitch
The Gersung microswitch is already fitted to the holder.
Insert and secure the switch holder in the button body before use.
05 · CWB 405
Standard Setup: New 30g Spring + Gersung Switch
Start with the supplied setup and assess the button feel in your own controller.
The 30g spring and 60g switch ratings describe different parts.
Samducksa’s new 30g spring is the spring installed inside the button. It plays a major role in returning the button after you release it.
The Gersung switch’s 60g rating is the manufacturer’s operating force specification (OF Max.) for the switch itself. It is separate from the spring rating inside the button.
These two figures should not simply be added together to describe the complete button as having a 90g actuation force.
The spring has a greater influence on the overall button feel, while the switch contributes to the click feel and actuation force.
06 · CWB 405
Installing the Switch Holder Correctly
Check the GIF and step-by-step photos below before assembly. Correct alignment allows the button’s movement to actuate the switch properly.
The Key: Insert at an Angle → Rotate to Lock
This differs from the straight-in insertion method used by the Sanwa OBSA series.
The CWB 405 holder must be inserted at an angle and then rotated to lock. If you have used Sanwa buttons before, check this assembly sequence carefully.
01. Align at an Angle and Insert
Do not start by lining up the holder directly with the white pressing tab. Position the holder at an angle and insert it into the button body.
02. Rotate and Align the Tab with the Switch Plunger
Rotate the inserted holder to secure it. Check that the white pressing tab and the microswitch’s red plunger are vertically aligned.
03. Check the Lock and Button Return
Make sure the holder is locked in place and cannot slip out. Press the button gently several times to check that it moves and returns smoothly.
If it catches, do not force or twist it. Remove the holder and check its orientation again. Disconnect power before working on the wiring.
During Insertion: Angled Position
Insert the holder while the white pressing tab and switch plunger are still offset from one another.
After Locking: Vertical Alignment
After rotation, check that the white pressing tab is aligned to press the red plunger correctly.
07 · CWB 405
Gersung V-0303A06 Microswitch Specifications
Keep the spring rating, switch operating force, and lighting voltage separate when planning your setup and wiring.
| Maker / Model | Gersung Engineering / V-0303A06 |
|---|---|
| Actuator | Pin plunger |
| Contact Type | SPST-NO (1a) — normally open |
| Electrical Rating | 0.3A / 24V DC |
| Operating Force | OF Max. 60g — manufacturer’s rating for the switch alone |
| Terminal Type | Solder or #187 tab terminals |
| As Supplied | Included as standard, already fitted to the switch holder |
What does NO mean? The circuit is open when the switch is not pressed and closes when the switch is actuated. Connect the switch according to your controller board and wiring specifications.
These specifications are based on the switch manufacturer’s V-series product data and model numbering guide. The switch’s rated voltage is not the LED lamp’s operating voltage. Gersung V-Series Microswitch Data
08 · CWB 405
Dimensions and Installation Clearance
Whether building a controller or replacing existing buttons, check the panel cutout shape and the space beneath the panel, as well as the button’s external dimensions.
| Model | Samducksa CWB 405 |
|---|---|
| Button Shape | Rectangular |
| Mounting Method | Threaded body + mounting nut |
| Top Outer Dimensions | 50 × 32mm (as shown in the supplied drawing) |
| Panel Cutout Dimensions | 45.5 × 28.5mm (check the cutout shape in the supplied drawing) |
| Cylindrical Body Diameter | Ø24mm (as shown in the body drawing) |
Check Both the Drawing and the Actual Parts Before Cutting.
The 45.5 × 28.5mm measurement describes the cutout area shown in the drawing. Ø24mm is the diameter of the cylindrical body; it does not mean you should simply drill a Ø24mm hole in the panel. Check the corner shape and whether the cover will be used.
The drawing below shows the button body. Also allow for the panel thickness, mounting nut, switch holder, and wiring space underneath.
Dimensions in mm · Based on the supplied CWB 405 drawing · Click the drawing to view a larger image.
09 · CWB 405
Understanding Microswitch Chattering
Understand brief contact behavior while checking persistent input problems separately.
What Are Chattering and Bounce?
Mechanical contacts can become briefly unstable as they make or break contact. This is known as chattering or bounce, and it can affect input signals depending on how the controller processes them.
PCB debounce timing can help manage this behavior to some extent. Operating speed, load, and contact condition can also affect it.
Investigate Repeated Input Problems
If a single press registers multiple times, or missed inputs or stuck inputs occur repeatedly, chattering may be one possible cause.
Check:
① Holder installation and alignment
② Terminal and wiring connections
③ Controller input processing settings
If the problem continues, review your setup and the symptoms. The affected parts may need adjustment or replacement.
Reference: OMRON Chattering FAQ — FAQE20041 · General information on mechanical switch contact behavior and chattering.
10 · CWB 405
Cosmetic Details to Know Before You Order
Minor Marks Inside the Clear Button Top
The inside of the clear button top may contain tiny speck-like inclusions or fine hairline scratches.
These cosmetic characteristics can occur during production. These minor marks alone are not considered defects. Please take this into account before purchasing.
11 · CWB 405
Frequently Asked Questions
Is an LED lamp included?
No. The button, switch holder, and microswitch are included, but an LED lamp is not included. For illumination, prepare a suitable LED and power supply for your holder and controller separately.
Do I need to buy a spring separately?
Samducksa’s new 30g spring is preinstalled inside the button body for standard use.
If you want to tune the feel, purchase a spring with a different tension separately.
Can I push the holder straight in?
The CWB 405 holder must be inserted at an angle and then rotated to lock. Check the assembly GIF above, even if you are familiar with Sanwa OBSA buttons.
How does durability compare with Sanwa buttons?
The internal switch has a major influence on durability. The CWB 405 offers an affordable option, while button feel depends on the spring, switch, panel, and personal preference.
If you would prefer an alternative to the Gersung switch, we recommend purchasing a compatible Zippy or Omron switch separately and fitting it in its place.
Will it fit my existing controller?
Do not judge compatibility by the button’s appearance alone. Check the panel cutout dimensions and shape, cover, clearance beneath the panel, terminals, and wiring specifications first.
ISTMALL · SAMDUCKSA
Six colors · New 30g spring · Gersung V-0303A06
LED lamp sold separately · Insert the holder at an angle, then rotate to lock
