Just wanted to add my name to the list of people who have used Frank Bowman's service with complete satisfaction.  This man really goes out of his way to help his customers and get the job done right.  If you need a new ring in your engine, he is the go to man.  You can send him the piston and liner and he will install the ring.  He did a great job on the O.S. .20-FS I just put back together.
Andy Borgogna