Valve Lapping Tool,Valve Lapping Kit,Car Accessories Valve Grinding Tool Valve Lapping Attachment Tool with 5 Suction Plates,Labor Saving Small Engine Valve Lapper Kit for Automotive

Does not come with any instructions on how to use. Attach tool to variable speed drill. Pick the size suction cup you need to fit on top of valve. Place a light coat of grinding compound on angled surface of valve and put back in the same hole in head it came out of with a light coat of oil on stem. Hold circular part of tool from turning while running drill at slow speed works like an agitator in your washing machine, back and fourth and around at the same time. Too much down pressure the valve will not spin. Check valve face often and clean well with brake cleaner when done.

For the cost, it works as it should. Is it going to stick like glue no. But it does save time compared to the manual approach

Return date was April 13.broke on the 14 of april..

Worked great for a n14 Mini engine

Worked great sadly only for about 10 minutes then the internals stripped out. Great idea

It showed up just like it was supposed to it works just fine with low rpm but I have done it by hand so long I finished by hand most people just use a dill on the valve but it messed up your seat and valve too big of seat smaller the better most valves only need about. .020 or that's my option. Higher the pressure the smaller

Great for using a drill to lap valves.

Good concept, but the suction cups have a hard time holding onto the valves. Sometimes they do, sometimes they don't. and it doesn't always help to try the tricks, like moisture, extra clean, etc... its hit or miss... I ultimately went back to my old school method