I have also used them on some scopes, with good results. I wouldn't use them on a Leupold though. For that quality of an optic i'd send it in for a factory TT installation (just my opinion though). I have 2 of them on a 6.5-20x Simmons, and a Tasco Pronghorn, both fit very well.
I bought 5 or 6 sets years ago, and just keep them around for buddies guns and miscellaneous stuff.
Good idea on the loctite. I'll give that a try.