I was using a Razo RA68 (I think it is) knob but I became tired of it rattling. I have a B & M Shifter and the Razo shifter knob rattled due to the additional vibration/high pitch whine of the B & M shifter. The Razo shift knob I have, has an insert to fit various diameter shifter shafts. Could someone tell me the diameter of the insert of the is300? I have damaged mine from overtightening it in an attempt to stop the very annoying rattling. I was thinking of getting another insert and trying some sort of rubber cement or SOMETHING to stop the very annoying rattling. I really like everything about the shifter EXCEPT the extraordinary annoying rattling. Any ideas?