Do these anti rotation pins fall out or are they attached to the piston somehow? ive been trying to reinsert the piston into the cylinder but i just cant doit. the rings dont seem to be compressing enough to slide it in. any advice? also i cant seem to lift the jug completely off the studs, it went up with ease most of the way but wont budge now that the studs are about an inch deep from the top. i was trying to get a good look at the crankcase like it is recommended but I couldnt get it to lift anymore, i then tried to reinsert the piston leading to this mess. do the 2 screws at the top of the crankcase have anything to do with it? i got one out but the other is frozen in there. sorry for all these noob questions.