This video demonstrates an easy way to resize the double headed screws on the rivet bracelet on the San Martin Vintage Diver SN004. The watch can be purchased at AliExpress through the following affiliate link,
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I encountered a great deal of frustration resizing this bracelet using the two screwdrivers which were provided, as I could not easily apply sufficient torque while aligning both screwdrivers to break the factory applied thread lock. This video describes the simple solution I came up with to address this issue.