Why are older Fender magnets chamfered on one of the ends?
Basically the magnets are chamfered on one end to allow the magnet to be pressed into the flatwork without tearing or cutting material away from the inside wall of the punched flatwork. If the magnets are inserted without a chamfer, the magnet can tear away enough material that the flatwork is loose and the ends of the top flatwork can lift or the bobbin can widen at the ends.
