A case already seen that we examine in more detail: a movement of an Explorer I with surprise.
Now, after checking that it is not loaded, we remove the rochet, and we find the "surprise".
As the barrel bridge had the oval hole, someone has seen fit to use a shortcut to "solve" the problem.
Probably remembering old (and unorthodox in many of the cases in which they were used) methods used to clocks type has seen fit to give a punched the bridge in order to bring a bit 'of material which lacked.
The result, more closely.
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