Hello, Raf:
I think the key (lock) has broken the shortest branch mainspring: the square hole in the plate (plate) seems to prove it. Also that the bowl (pan) in the ball and seems to be drawing the battery dock.
I think any key (lock) could depend on the inertia of a rake (Frizen) heavy, without spring, because any sudden movement would that moved out of position. There is, in any museum or collection, a gun (or its remnants) with this feature.
Affectionately. Fernando K
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