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Once the piston is completely inside the bore, you can set the ring compressor aside and push the piston in the rest of the way by hand. But before you have even installed the rod and piston, you should make sure the crank's rod journal for the cylinder you are working on is turned so it's as far away from the cylinder as you can get it. Be careful to guide the end of the rod over the journal so you don't scar the rod journal. Alternatively, you can also use a 3 or 4 inch length of plastic tubing placed over the rod bolts to protect and guide the rod end so as not to scar or scratch the rod journal.