After finishing my 520/15 Zeiss Ikonta with a fixed 47mm Super Angulon a couple years back, I almost immediately started building a companion camera with a less extreme 65mm in a focus mount. I had planned on using the original Zeiss focus mount for the 65mm f/5.6 Super Angulon but after taking it apart to clean out the 50 year old grease, I could not get it back together. I sent it to camera repairman extraordinaire Bob Watkins at Precision Camera Works who thought it might ever so slightly bent as he too could not get it back together. Not wanting to use one of the cheaper plastic eBay helicals, I opted for a Fotoman helical which (despite it large size) is amazingly smooth and solid to operate. I originally planned a more compact (and attractive) spacer but the larger helical required a very functional albeit unattractive box style spacer to get the focus perfect. As always I enjoyed the process and the problem solving, especially glad I sent it to a leather guy and had the camera recovered after stripping the old paint and leather. Enjoy!