You might try non-hardening gasket sealer (Permatex No 2?) on those adjusting nut threads. Should fill the gaps better than the RTV you tried, although if you put enough of that on that it oozes out and then wipe it off, it should work. RTV requires that there's no oil or grease on the surfaces for a good seal.


Kevin
1951 Chevy 3100 work truck
Follow this saga in Project Journal
Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.