I have seen photos of these rubber blocks, however mine are missing! I have a friend with a couple stock variators. I may throw one on and try it out. Thanks for the replies, guys! Another strange problem is that my Dellorto Sha 15 keeps ejecting itself. The clamp gets tight enough that the carb won’t move by hand but after a little while at high rpm’s it shimmies right off! Perhaps I’ll buy a new plastic shim. It’s a Polini intake btw. I’ve heard spigot setups are ideal on these, so maybe i’lll do that fib i decide to keep the bike.