Mark, will pick up some R-12, advice well taken. I went thru a similar event when I bought a used BMW which had not been operated for awhile. Cost me $1000 to have all AC o-rings replaced, $3 worth of parts, and the balance to take the car apart! Question, when servicing the O-rings, can the oil be run thru the filler valve which should find it's way to the wing cylinders, or should it be applied directly to all the rings? Also, the gears are locked in the down position and have a bit of slop in them. When I get some pressure to them, do I assume it will release the locking device and they will become tighter or is the slop normal? Finally, know where I can get replacement rings if necessary? Thanks for all the help, Joe