Thanks! I'll check them out. Larry [email protected] wrote: > > Mark Krause made a self contained hammer and sells a booklet with > valving details (Mark S. Krause > 6030 Roblar Rd. > Petaluma, CA 94952 > > Ph: 707 664 0767 > Email: [email protected]) > > John Larson on www.keenjunk.com has also made a self contained > hammer. IIRC he used 6" cyls.