Thanks for all the info, I think I will just pick up a Z6 and have it converted, Probably Lifepixel, they are the only ones I have delt with in the past, unless there are other options.
Hi L Daneman
I see this thread is quite old.. I still would be interested in your technique for forming/remolding the tabs. In my example, I have two of the three. I have not removed the molded plastic ring from the ?? helical?? I suppose this is necessary to reform the tab(s). In my precursory view, I suspect the repair was to replace the ring..as the tabs are (or seem to be) integral to the ring.
I noted what were three ? screws that might pertain to holding the collar in place. Unfortunately, it looks like one of the three is damaged . The other two had slits , but this one looks round. IS is maybe just a registration point. Photos would of course be helpful. Do you lube the collar slits that the tabs ride in? My focus is stiff, but it seems the helical grease has hardened. Any phoptos or insights would be welcomed