Good M42 to C/Y Adapter?

[das]

I bought some cheap generic M42-C/Y adapter, and it wobbles a little in the Contax mount. Does anyone have a suggestion for a snug fitting adapter? I've seen the expensive Kipon ones, but for $60, kind of steep for a little ring, and also not sure if it also "wobbles." Thanks!

 

[das]

Well, I guess I found the answer. For future reference, a bunch of East German and Soviet M42 lenses do not play nice with either the M42-C/Y or M42 to K Mount adapters. These lenses need a slight shim between the body and the lens so that everything fits snug. A quick fix for me was to put a single layer of electrical tape around the threads on the base of the lens (CZJ Flektogon). An o-ring would probably be a better solution. The tape thing seems to preserves infinity focus and eliminates the wobble.