M Spool that converts the Leica M2 & M3 take-up to M4
Fits into both M2 & M3 cameras, replaces the spool used for these cameras. This is a 3-pronged spool just like in the M4-M7 cameras where you slide the film lead into the spool. Once this spool is in the M2 camera you can leave it there, however in order to reset the M3 counter you need to pull the spool slightly out & then back in before you load a new roll of film. The same baseplate for that camera can be used w/o adding anything.