Well the other day I sat down in front of AS and started reading. Gathering info on minimal squish and maximum compression. The general consensus for safe work saw squish is .020. I have two saws (80+cc) currently running .0175 with no issues and decided to find the limit. Test saw is a ms660. Started with the squish at .016 and ran it for a tank with not an issue. Tore her back down and repeated with the squish less every time. Granted there are many variables in measuring but did the best I could. Any guess's how tight she got? Will say this, I had to slice my solder in half just to get the saw to turn over.