Originally Posted by jonwvara

I seem to recall Jobst Brandt or someone sternly (he was stern about almost everything) advising against that. The idea was that the proper amount of torque at the initial tightening would push the arm onto the taper as far as as safe, and that further tightening later risked expanding it too much and causing it to crack at the corners of the opening.

Does anyone else remember that? Maybe I dreamed it.

But I think that loctite is probably a good idea.