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I use a piece of white PVC pipe as a drift. If you take them off in the right order you can get them all out. I wouldn't be concerned if you take the pistons out of the cylinders. Just keep the pistons with the same cylinder they came out of. In fact I like to remove the pistons on the bench and check the wear of the ring lands and the end gaps of the rings (at least a sample of them). After inspection I clean up the pistons, lightly oil them and put them back into the cylinders to install when I re-assemble the engine.
I've put together several engines this way with the old rings and not had a seating problem. Just make sure each ring stays with it's particular cylinder and piston and is installed the right way. I try to put the gaps for the top ring where it was when I removed the piston but this is probably overkill.
-Andy
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72 Carrera RS replica, Spec 911 racer
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