Piston ring compressor tool for air compressor rebuild?

Bill Crowell said
Wow, ACME SS, great answer! Thanks for all the effort. I was able to lower the cylinders over the piston rings by carefully pushing the rings into their lands with a tiny screwdriver, but was just wondering how to do it next time. Thanks again!
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Yep it can be done like you did but it is pretty tricky. It's easier when the rods are not bolted to the crankshaft. Good job.