Look at the groove in the piston closely. Follow it all the way around until you see a small pin partially blocking the groove. That's the alignment pin.
Now pick up the ring and look at the ends. Are they cut off square or angled? If they are angled, then install them so the angle matches up...
Cut a piece of aluminum out of an aluminum can about 2"-3" square. Put the rings on the piston, making sure they are oriented correctly and the ends are lined up with the alignment pin in the piston groove. Wrap the aluminum around the piston and rings like a sleeve (think of a coozie on a beer...
Try trimming a piece off an aluminum can to make yourself a small ring compressor. Wrap it around the piston and rings like a sleeve and slide the jug over it. I'd say trim it to wrap about 80%-90% of the way around the piston. Once the jug is over the rings then slide the piece of aluminum out.
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