I have been thinking about getting a RP #20. The newer ones have cast-in mounting ears to bolt them down to a bench. The old style used a separate base. Most often the old style used ones are sold without the base. At first I thought the bases were just lost or got separated from the punch bodies. However, I looked at an old (1981) RW catalog and it seems the bases were always sold as an option so I guess many of these punches were actually purchased originally without a base. Without a base how were these used? They are called "portable" but I don't see how could be used without being bolted down to something. Does anyone have photos of a shop made mounting base for an old style RW #20?