Cost update to date is as followsB51 $259Regulator from Milo74 $802 McMaster Carr springs 94125K125 (pk of 5) $13.28+shipping As far as cash outlay, that's where I am at to this point. I used one of the springs in the hammer and the other I cut, rolled and polished for use in the valve. Had to make a bushing for the spring to work on the valve stem as it was to big of an outside diameter. I have on order a Marauder spring and some proper material to make a hammer. Don't laugh...seriously, I didn't add the cost of material for the hammer I am using because I sacrificed 2 Craftsman screwdrivers! LOL... I have been taking pictures as I go and once I get things sorted out (or as close to it as I can as I still have a TON of work to do) I'll post them all in one post.