Originally posted by Dewman Good idea? Bad idea? So-so idea? Or, stick to the blue Locktite and be done with it?
I think you are over thinking this. I used a 'fixed' adapter on my S-M-C 400mm for years. I used a k-mount cap to tighten the adapter on the lens as tight as I could get. Which is not all that tight using a plastic cap. It never budged and I had a tough time getting it loose when I sold the lens.
I always mounted the lens onto the tripod first, then attached the camera. Reverse that to put things away. I never trusted this for hand held shooting, although I know people who do. At any rate, the failure point in this combination is the adapter-->camera not the lens-->adapter.
And remember to remove the spring on the adapter when using it like this.