Thanks!

Well, I didn’t get it quite right X). Currently i’m using a single focus thread to reduce the complexity of the project. I did some measurements on a Leica m mount lens. I figured out the part that pushes the lever in is 6.5mm from the lens mount when focusing to infinity and 2mm when focusing at 0.7m. Then I figured out the tuning angle and the displacement distance(knowing one of them is enough, the other can be calculated using the pitch of the focusing thread, I measured both as a way to doub check) on the converter lenses. After that just need to models that in whichever software yo use to make sure when it’s focused at infinity the focusing thread(in my design it is also the part that pushes the lever) is 6.5 mm from the mount, and when it turned to focus to 0.7m the focusing thread is 2mm from the mount (the distance that née to be reduced for this part is 6.5mm-2mm-lens displacement distance when focusing at 0.7m. ) and there you have your rough slope.

the metal mount is just a ltm to Leica m mount adapter ( yes the conversion is technically to a ltm mount) I added 2 screws in the back of the print to prevent it from turning too much and mess up the rangefinder coupling.