There are several U-tube videos on cervical dislocation.
I generally use an empty tin can that had one end cut out with a can opener. Holding the mouse by the tail, put it on a sturdy surface. Place the open end of the can over the mouse's head. The can's edge is positioned on the mouse's neck. Press the can down hard.
The mouse will kick for a short time and sometimes bleed from the nose or mouth. Immediately dropping the mouse in a container of some sort will minimize that.
I've never done it, but I think a snap mouse trap could be screwed down to a heavy piece of wood so it wouldn't fly up when triggered. That would make a decent cervical dislocator.
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