Leica LTM-M adapter does not work on all my Leicas!

I also own a 9cm adapter. I have many adapters. The challenge is finding them within a few minutes.
 
Huss,

If you have not sent it back yet, I have an idea what is wrong, and how to fix it.

The Hard Stop at the camera's lock button:

Leica M2 Mount Hard Stop
by sreed2006, on Flickr

Adapter Hard Stop vs. Lock Groove, adapter 1.

Adapter Hard Stop Edge
by sreed2006, on Flickr

Adapter Hard Stop vs. Lock Groove, adapter 2.

Adapter Hard Stop Edge
by sreed2006, on Flickr

Inside the camera, between the lens lock and the film, is a piece of metal that prevents turning the lens or adapter past the lock position. In the picture, it is labeled "Hard Stop."

The two different LTM to M adapters both work on an M3, M2, and M4. The red arrows on the pictures of the adapters show where the metal that bumps into the camera's hard stop is situated. There is quite a bit of difference in how far that edge is from the center of the adapters' lock grooves.

However, if the adapter that is giving you trouble has a hard-lock edge that is not clear of the center of the adapter's lock groove, then the adapter cannot turn far enough to have the camera's lock match the adapter's groove.

Use a fingernail file to shave off a bit of the adapter's hard stop edge, to get the edge at least past the center of the lock groove, and you should be good to go.
 
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