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Place towels to fill oil return holes. Dropping a keeper and not finding it is a problem. I have used the air method and a tool similar to the one Mancini sells. I can say I have learned something here today I have thought about every time I have put a spring compressor on a valve held up by air and the piston at the bottom of the stroke. I would like to here more about puttin the string in the cylinder to support the valves.



The rope works great. Just make sure the piston is down, then thread a bunch of rope through the sparkplug hole into the cylinder. Then gently turn the motor over by hand until the rope hits the valves/head and locks the engine up. The rope keeps the valves up, just roll the engine back and remove the rope when you're done.