my long reach hedge clipper has a worn pinion gear.... the 2 sided pinion gear located in between the shaft pinion and the final pinion gear. Has anyone here replaced this part before? Should I replace all 3 pinion gears as a set? (MOST of the wear is on the 2 sided pinion) Is it cost prohibitive to replace? IOW will I find that for an additional $50 I can replace the whole gear head? thanks in advance for the help.