I have a Leopold fc660m with Leopold’s stock ~1.5mm thick PBT keycaps. The spacebar produces a weird sound on the upstroke. I’ve ruled out stabilizer rattle, and I’m not concerned with how loud it is. Instead, it produces a “mechanical fart” sound, akin to when two of those fidget magnets stone thingys collide.
Here’s a video
This problem existed with the original switches, Cherry MX Blacks (85g) and persisted after I swapped them for Glorious Pandas (67g). I thought that the problem would go away after I swapped them for a lighter switch. The spacebar is made of PBT at the same thickness and comes in at 7.9g.
The reason why I’m putting all these weights here is because my theory is that the momentum that comes from having such a heavy spacebar along with the force of the spring causes it to rebound when it tops out. I think having a lighter spacebar would fix this issue, but I like this one, and would just rather not have to order a new one.
If I’m right, are there any modifications I can do to mitigate this? Otherwise, what is the source of this sound?