Fernando, namesake
The fact that the frizen face is narrowed down, and also the "dovetail" of the original frizen, is a mechanical solution, so that as the insert is put into place, the transversal pressure that is exercised ensure its positioning, without the need for screw or tight fixation, or welding (as I have seen in some copies)
It is unfortunate that we do not have more images, where you can see the configuration of the lock that you had the kindness to upload, for me
affectionately
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