Personal use and recommendation of this individual who is now a retired Canon Repair Technician. Have used him to repair / optimize two manual Canon lenses from the 80's, and now have a 3rd one on the way to him. Posted this on the Photo.net site / Canon FD Forum, and am also including it here for anyone who might need such a service in case they use adapted Manual Canon Lenses. =========================== Steven F. Sweringen c/o Camera Clinic, USA 1220 E Greg St. Suite 15 Sparks, NV. 89431-6530 Just some worthwhile feedback…can’t say enough good about this individual that was recommended in a thread here on this forum. (Photo.net / Canon FD Forum) Last year he replaced some worn parts in a used FDn 200/4.0 Macro Lens, cleaned & adjusted it, and its become one of my very often used lenses. I recently noticed an FDn 300/4.0-L had developed some slop / over travel when making the final rocking back & forth motion while fine tuning focus.....sent it to Steve...same outstanding result.