Yes, that was the first thing I thought of, magnet on a piece of plastic tubing. Pistons are aluminum so would have worked. I sure hope the first test was bogus because of a screwed up tester release valve.

1 = 70psi

3= 60psi

5= 85psi

2= 0 (button found here) (spring for button found in cobweb somewhere)

4= 0

6= 0

Going to rig up 1/4 ID tubing to the shop vac and get it to "stick" to the suction. The piston got stuck during trying to get to TDC. If it was the exhaust stroke it hampered the first shop vac effort before we know if and where it was. Tried to bring piston near top to create a small chamber. The chamber would have not pulled a good vacuum if valve open. Does not matter now we know it's in there and where, no need to pull a vac on whole chamber. Probably better to let piston down now for better visual and straighter attack angle for hose/tube.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn