Does your mechanical keyboard feel like you are typing on a slab of concrete? If you are using an entry-level kit, you are likely experiencing the harsh reality of a standard tray mount. This rigid structure creates inconsistent sound and a jarring bottom-out feel. However, you do not need to buy a new $500 board to fix this.
The O-ring mount mod—often called the "Burger Mount"—is a simple, cost-effective solution to the tray mount friction fix dilemma. By adding small silicone rings to your mounting points, you can isolate the PCB from the case. This guide will teach you how to execute this mod to improve GH60 typing feel and transform your entry-level board into a thocky, flexible typing machine.
What is a Tray Mount and Why Modify It?
Before diving into the burger mount tutorial, it is essential to understand the problem. In a standard tray mount system, the Printed Circuit Board (PCB) screws directly into the bottom of the case. There is no buffer. The metal screw heads clamp down hard on the FR4 material.
This direct contact transfers every vibration into the case, causing a high-pitched ping. Furthermore, the mounting points in the center of the board create "hotspots." Keys near the screws feel stiff, while keys on the edge feel softer. This inconsistency is the enemy of a premium typing experience.
For a deeper dive into how different materials affect this interaction, check out our guide on how to change keyboard sound by swapping plates.
The Burger Mount Mod Explained
The O-ring mount mod is affectionately known as the "Burger Mount" because of the layers involved. You sandwich your PCB (the "patty") between two O-rings (the "buns").
The structure looks like this:
- Screw Head
- Top O-ring
- PCB
- Bottom O-ring
- Case Standoff
This suspension system creates a buffer zone. It allows the PCB to flex slightly during typing. More importantly, it breaks the metal-on-metal contact, significantly reducing case ping and evening out the sound profile across the alpha keys.
Tools Required for the Mod
You do not need heavy machinery for this. Here is your shopping list:
- Precision Screwdriver: Usually a Phillips #0 or #1.
- O-rings: Size M2x4mm or M2x3mm (Silicone, approx. 50A hardness).
- Tweezers: Helpful for placing tiny rings.
- Your Keyboard: A standard tray mount case (like a GH60) or a mod-friendly kit like the NPKC RO75 PRO Mechanical Keyboard.
Step-by-Step Burger Mount Tutorial
Follow these steps carefully to ensure you improve your typing feel without damaging your components.
Step 1: Disassemble Your Case
Remove all keycaps and switches (if your board is hot-swappable). Unscrew the PCB from the case. Place the screws in a magnetic tray so you do not lose them.
Step 2: Place the Bottom O-rings
Take your tweezers and place one O-ring on top of each brass standoff inside the case. This is the bottom "bun." Gravity should hold them in place.
Step 3: Align the PCB
Gently lower your PCB (and plate assembly) back into the case. Be careful not to knock the O-rings off the standoffs. Align the screw holes on the PCB with the standoffs beneath.
Step 4: The Top O-rings and Screws
This is the tricky part. Place a screw through a second O-ring. Then, insert the screw-and-ring combo into the PCB hole. The O-ring should sit between the screw head and the top of the PCB.
Step 5: Tighten with Care
Do not over-tighten. This is critical. Tighten the screw until the O-ring just starts to compress. If you crush the O-ring completely, you lose the benefits of the mod. You want the assembly to be secure but capable of slight movement.
Sound and Feel Comparison
After reassembling your board, the difference should be immediate. The harsh "clack" of the standoffs is gone, replaced by a softer, more rounded sound.
| Feature | Standard Tray Mount | O-ring Burger Mount |
|---|---|---|
| Typing Feel | Rigid, Hard Bottom-out | Softer, Cushioned |
| Sound Consistency | High variance (Hotspots) | More consistent across rows |
| Vibration | High transfer to case | Isolated/Dampened |
If you are looking to further customize the sound profile, consider what switches you are using. A frankenswitch can pair beautifully with a burger mount. Learn more in our Frankenswitch Guide 2025: Master the BCP & Holy Panda DIY.
Case Study: Modding the NPKC RO75 PRO
While this mod works wonders on generic GH60 cases, applying it to a higher-quality kit yields even better results. We tested this on the NPKC RO75 PRO Mechanical Keyboard.
The RO75 PRO already features a robust construction, but for enthusiasts who prefer the specific feedback of a tray mount setup over gasket mounting, the burger mod provides the perfect middle ground. It retains the direct feedback users love while eliminating the harsh fatigue associated with long typing sessions.
To learn more about keyboard mounting styles generally, Keyboard University offers a comprehensive breakdown of the physics involved.
User Community Feedback (UGC)
We asked members of our Discord community who tried the O-ring mount mod on their daily drivers to share their experiences.
"I was about to sell my old 60% board because it hurt my fingers to type on. Spent $5 on O-rings and did the burger mount. It literally feels like a new keyboard. The thock is real."
— User: ClackToTheFuture
"Used M2x4mm rings on my NPKC kit. It raised the PCB slightly, so make sure your USB port still aligns. Once I got it seated, the sound consistency improved massively."
— User: SwitchDoctor99
Frequently Asked Questions
1. Will this mod work on any keyboard?
It works best on Tray Mount keyboards where the PCB screws into the bottom of the case. It is not necessary for Gasket Mount keyboards, as they already provide flexibility.
2. What size O-rings should I buy?
The standard size is M2x3mm or M2x4mm. M2 refers to the screw diameter, and 3mm/4mm refers to the thickness. 4mm provides more flex but may raise the PCB too high for some USB ports.
3. Can I use the O-rings meant for keycaps?
Generally, no. Keycap O-rings are usually too wide (M5 or larger) and won't fit neatly around the M2 screw threads or sit well on the standoffs.
4. Is the Burger Mount risky for the PCB?
If done correctly, it is safe. However, because the PCB is "floating" on rubber, do not aggressively torque the screws. Also, ensure the USB port remains aligned with the case cutout.
5. How does this compare to Gasket Mounting?
Burger mounting creates a feel similar to a stiff gasket mount. It is a massive improvement for tray mounts, though a purpose-built gasket mount board (like the gasket configuration on the RO75 PRO) usually offers more uniform flex.
Conclusion
Improving the typing feel of your keyboard does not always require a massive investment. The O-ring mount mod is a testament to the ingenuity of the mechanical keyboard hobby. By simply adding silicone buffers, you can remove friction, dampen ping, and enjoy a premium typing experience.
Ready to start your modding journey? Ensure you have a solid foundation.
