I will try the protection rings first, thanks so much for sharing! I do already have 3 layers of electrical tape there, so I'm not sure how that will work, but I'll give it a shot. I read your instructions, but just to confirm: does the rings go between the downside of the button and the membrane?

EDIT: I printed a small batch, but the printer itself is in very bad shape, with at least a warped bed and a worn-out extruder, so the prints are of a poor quality. Worth a shot still.

I'm also going to stop by a big box store and see if I can find a rubber washer/spacer that would be about the same size.