Abstract: A replacement pin for a worn or broken guide arm pivot pin for a dual arm windshield wiper blade transmission assembly. The assembly comprises a transmission body having a shaft received through a bore for reciprocal rotation of a wiper blade arm secured to one end of the shaft and a guide arm pivot pin secured to the transmission body in parallel to the aforesaid shaft and adjacent to the end of the shaft which receives the wiper blade arm. This pin is provided to pivotally receive a wiper blade guide arm. The replacement guide arm pivot pin is coaxially received with a force fit over the remaining broken base portion of the original pivot pin.