What I will try now is file and polish 5 primer caps and with a carby that I know is working properly fit the 5 primer caps and needles and see what results I get with each one. Then I will keep each set in individual containers so I can then fit them to carbys as I need and see if they work after sitting for some time. Very tiring but I have to do this before I commit to picking up another 30 motors. If they don't work I am done with them