Originally posted by lmd91343 
Purple Loctite creates a much weaker bond than blue. That's what I use. It can be found at Amazon or Micro-Tools.
Ok. I've never used any of them (for this purpose). It is unlikely to need anything at all as the only thing loctite will do is keep the adapter on the threads and that isn't much of a problem -- once in a while when you go to dismount the lens it will get a little loose (which doesn't matter cause you are dismounting) and you can just crank it down again with a K rear cap. But loctite won't do anything to keep the lens w/ adapter attached (which is not locked into position on the body) from moving in the mount when you are focusing, etc. But for most lenses this isn't a problem either as there is plenty of friction or you just learn to hold it in place with one hand while focusing with the other. I've got lots of m42s with these adapters semi-permanently attached (but I always have more lenses than adapters so they do move from lens to lens a fair bit depending on what my current favorite lenses are) -- the only ones that need special handling because of lack of friction are some of the German models with their tapering bases that provide no friction at all. Pretty much any Takumar you should be able to screw the adapter on, give it a little tightness with a rear K cap, and you're ready to go. As long as you aren't totally careless and forget that it is a friction fit, you'll likely have no trouble at all without the need for any additional adhesives or cutting notches into things, etc
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