Quote Originally Posted by Lee L
I believe you'll need to learn to cut the film leader a bit longer before loading, as it requires a longer trimmed-down section, although I think some folks manage to do without that. I've seen dimension templates for that on the web, but can't recall where.
If I recall correctly, there's a picture of the required leader shape on the inside of the camera base. The required length of half-width leader is 100 mm plus a few mm, minus nothing. It's well worth cutting the leader with a IIIf (or any screw-thread Leica), because otherwise attempts to load the film may result in film abrasion and the release of particles in the camera, which may go unnoticed for some time (the M3 is a bit different as it has a hinged back).