1. Insert proper cam follower (flat or radius) for particular application into desired end of sleeve. 
2. Tighten middle set screw until it touches the cam follower shank – then back off one-quarter turn.  The cam follower will now be free to move up and down, but it is retained in the sleeve so it cannot fall out. 
3. Hold the cam follower against the end of the sleeve while installing the dial indicator in the opposite end. 
4. Slide in indicator, allowing the sweep hand to rotate until indicator is nearly out of travel, then tighten set screw.  (It is important that the cam follower be bottomed out against the end of the sleeve before the indicator runs out of travel.  This will prevent over-travel damage to the indicator.)
5. Make sure lifter bore is clean, free from grit and lightly oiled.
6. Grasp cam check sleeve, insert into bore, and push tool firmly into the bore using a slight twisting motion.
7. Rotate cam one full turn, allowing tool to be pushed up as lobe rolls over on full lift, stopping at cams lowest point (base circle).
8. Pull tool up (out of bore) an additional .040” to .060” and set indicator to zero.

 NOTE: Do not bump tool when in use and always check to see that indicator will zero when passing over the low point (base circle) of cam.  

If after extended use the cam check sleeve loses some of its gripping force in lifter bore, check for worn or damaged o-rings.  Replace as needed with standard o-rings as follows:  

27/32” diameter (GM) end – 3/32” thick x 5/8” I.D. x 13/18” O.D.