Looks like there is no longer any factory service available for Rollei lenses (someone correct me if I am wrong). I did not find much at all with an internet search for Rollei 6000/SLX lens repair information so I am posting this as a start. I think APUG has more popularity than the KYPhoto forum but maybe I'll post this there also http://www.kyphoto.com/cgi-bin/forum/discus.cgi . I'll show how to open up an 80mm 2.8 Planar from the front and the rear. From the rear: Mark the bayonet for re-assembly (Sarpie marker comes off with isopropyl alcohol when finished). Remove the silver screws around the perimeter of the bayonet ring (don't remove any of the black screws visible).