I have a '67 1020 Deere. The handle for the 3point just snapped off the end of the shaft. I’ve put penetrating oil, rust penetrant WD 40 on it and vice grips. This thing is stuck good. I took the bolts out of the AT20198.A Quadrant Assembly and when I moved it the arms function fine. Does anyone know of a way to unfreeze this rusted shaft without taking the rockshaft housing off?