I was a second run guinea pig from a fellow owner on boxa.net Username is jimk04 and he posts here from time to time. From memory the poly is nothing special, 80 shore from memory. I didn't want a rock solid mount with loads of NVH and in discussion with Jim was concerned a harder shore and also both sides filled would be too much so I chose this option as a trial. They've been in since 2015/16 ish. I've always been one of the first to try Jim's stuff, underdrive pulley and metal shifter bearing inserts too. I did a brief write up on boxa.net
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