Originally Posted by Holmz
I got a used 12mm Helier, and it is has a clicking sound and physically I feel an element floating around inside of it, and the f-stop end is also loose.
I bought a 15mm Heliar used and it had an identical problem. Ended up sending it in for repair which was a matter of tightening up screws and rings. Can't remember the cost, around $30-50???
Even Leitz lenses come loose in time. Had to have my late sixties 21mm Super Angulon tightened up recently. Forty years of use finally took its toll. The repair man said he'd never seen one that was that loose. Too many miles of transport via jet, motorcycle or LandRover I guess? Sounds like your lens may have seen a bit of use.