deskthority

I was just wondering how a thin layer of felt would work for a trampoline mod.

Hmm.. Good question. I wonder especially about the "thin" part.
Felt is used for dampening into piano key mechanisms but those are an order of a magnitude larger.

Ah, thank you seebart.
I was just curious, posed the question purely for speculative purposes. And yes, piano keys were the reason I asked.

Industrial uses of felt:
Felt is frequently used in industry as a sound or vibration damper,[38] and in machinery for cushioning and padding moving parts.[39]
-Wikipedia

I expect rubber to add a bit of softness to the bottom-out of a keyswitch, and felt material doesn't have as much give. I was thinking it would be excellent to use for people who bottom out, to deliver a quiet but solid end to the keypress.

But what do I know? I'm just the piano player.

I'm not sure if it yet exists, but I'd like to try and find a half-millimeter thick felt pad. Thinner, if possible. If that addresses your uncertainties, Findecanor?