While pigtail cables aren't a mass-market item, extension cables
are. Check out
http://www.pimfg.com/Product/PS-2-Keyboard-Cables
for a few possibilities.
Making connections inside the mouse, you might end up
splicing wires, alas, at least one more time.

On Sunday, July 8, 2012 6:57:08 AM UTC-7, Robert Macy wrote:

The plug is molded making connections a pain.

The end that breaks [usually] is near the mouse where all the flexing
occurs. ... just want a fistfull of replacement cables.