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Fixing a serial mouse

The nice thing about three-button mice is that they are brilliant at cut and paste; Left button cut, centre button paste. You need to set it to mouse-systems mode though. See: Switching a Mouse to 3-Button Mode

Three Button mouse Mouse internal

After decades of use the left mouse button micro switch may fail.
In my mouse I replaced this by a Zippy DF-03S-0P-Z, but a Zippy DF-P1L-0P-Z may work as well;

Zippy DF-03S-0P-Z