Just got one of these presses, and low and behold the snap motion reared it's head. I used my google fu and found this fix. I was ready to order the shims and thought I would just check to see what I had on hand that might work. AR barrel nut shims are a direct fit, and I mean direct! You wont even be able to tell there's a shim in there. They do tend to be a bit more pricey than the arbor shims, but if you happen to already have some on hand.....


Many thanks to the OP, you sir are brilliant, I would never have thought this was the cause.