Hi Jeff about 50 % of the ones I fit stick in the seat when trying them for float clearance and most work fine, I know one mower I sold I went back there 3 times in 3 days to replace the primer cap and needles and that was after it had had a new primer cap and needle to start with. Haven't heard from him for 6 months now so it should be settled down now. I had a bad run on them for a few weeks but then it settled down again, not that I am doing many at the moment and we are heading into winter now. Yes I would have given up on the 2 strokes if I had had to continue trying to get those useless plastic needles to work
