Re:
Being a very short leap away from re-constructing my Mag 21 Ti's, with freshly painted lowers (am picking them up today - woohoo!), and new bushings, mainseals, and o-rings (managed to scrounge all that stuff together) ... I was mulling over what I'd do if I found the needle valves to start leaking on me at some point in time. Well, it sounds as though you guys have devised a relatively easy-to-do fix, but I've got to ask ... what is this 'RTV' sealant of which you speak; and does one purchase it at an automotive partsandtools supplier?
Your guidance/assistance will be highly valued.