If you're not going to reuse the piston rings (which isn't a good idea anyway), just remove them from one of the pistons to reinstall the piston and rod to the crank. No need for a ring compressor (yet).
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.