Caseback integrated with movement and crystal does not lock into bezel
This is an odd configuration. The movement fits into the case back and the crystal friction fits on the case back. Then the whole thing mounts into the bezel (for lack of a better term).
When I took it apart, there was enough grime and rust to keep it all together, but after cleanup, the module (case back + movement + crystal) just falls out of the bezel.
Not sure what to do. It cannot go as is.
The first image shows the module alongside the bezel.
I do recall some st
That appears to be the style used for many Benrus watches (what you call a module I call a capsule). They sold a special press with unique dies for assembly and disassembly, but manual pressure is often sufficient, especially since nobody is expecting them to be waterproof anymore.
The thickness and fit of the crystal is an important part of the geometry needed to get a tight engagement between all the parts. I wonder if yours was a not-quite-thick enough replacement crystal that required s
