Trying to find away to extend the life of my pedal & Z-bar. they are slightly oval shaped from on & off use over the past 35+ years. I have new upper & lower rods that I don't want to rush the wear on. I would like to put bushing in to help but not sure what to use-plastic, steel, brass,... I know I'll have to true up the holes & make them big enough for the bushings. I know there are other methods out there, but I want an O.E. look.