soksavik wrote:That's why a deeper sleeve/collar is probably a better answer than another spacer ring. Using the shortest sleeve possible is a good goal, but the fact of the matter is that the door is thin and the mortise cylinders are long. Selecting a shorter, less secure cylinder (would probably have to be a five-pin cylinder with no sidebar) is a cure worse than the disease IMHO.
Why do you feel that way? I have 5-pin medeco mortise cylinders in stock. Even if the door is a 1 3/8" the standard collars should work fine.
Having seen a break-in on one of these locks years ago i would recommend the use of a latch-guard also
BTW these type locks need to be fairly tight on the door, otherwise they will float around in the 2 1/8" mounting hole, and that will cause premature latch failure
I inherited a big box of these from my Dad when he retired (finally) and I don't Ever sell them. Once I had a client with a 2" backset, that is what they excel at, they make one weird size...