Physically bend the center links and decouple to shorten.
Best to let your local watchmaker do it if you don’t have the tools.
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Resizing Gay Freres Bracelet
I have just acquired a Gay Freres bracelet but I have no idea how to resize it as I don't see any pin. Does anyone here know how to shorten this bracelet? Many thanks in advance. ...
I will heed your advice and not attempt this myself