go-no-go feeler guages. I have set of Mack tools go-no-go feeler guages when I would set the valve lash on the rocker arms of my old Datsun 200 . Your compression tester looks like mine . However the screw in part was short would not seal well. I borrowed my friends Snap-on compression tester with a longer screw in piece and my compression went up 25 psi. Good job on the write up. You have more time than me . Mike
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