So you have 2 F4i's and only one has the cush drive rubber. Well hell. And you dont have any rubber blocky looking things laying around you garage or driveway or workbench?

No, there's no trace of it, i was using that bike lately and a few months before it was ok but suddenly it started doing that clunky noise and when i released the clutch it pulls you hard.

I just took mine apart and there are only 3 rubber pieces left. The rest seem to have disappeared as well. After a little inspecting, I noticed rubber chunks stuck in the carrier. I believe they are disintegrating and falling out in little pieces. I’m just going to order a new set.