I struggled with mine for a long time - even heating it with no success. Finally from the back I drilled a small hole in the arm on the centreline of the motor shaft - threaded in a grease fitting - one pump of the grease gun and it popped right off. I can live driving around with a grease fitting on my wiper arm.
Good luck
Robin
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Tuesday, November 14th, 2006 AT 8:54 PM