I was working on installing a 44mm Airsal kit onto my A3 Tomos tonight when I noticed this. The locating pin for the lower piston ring appears to be missing. The black circle you see in this pic is the hole for the pin, but the pin itself is nowhere to be seen (the pin for the top ring is there)
I've never seen this happen, but boy am I sure glad I checked. Guess I'll run it with just one ring until I can get a replacement. (edited)