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Time to make the end caps the cross bar pivots on, I cut a piece on 1/8" thick plate 2 1/2" x 5" and bent it in my vise then welded a piece of tubing 1" inside diameter x 1 1/4" long. I needed to clean out the inside of this tube with a grinding stone attached to my die grinder so the cross tube would pivot freely inside.
Not owning a lathe I took a piece of 1 1/2" round stock black phenolic plastic to a friend who does own a lathe and had him copy the guide wheel from my panel.
I proceeded to make the guide rails from 3/8" round bar stock, although I could have bought nice shiny stainless steel rails for $65 / side I've decided these will work just fine once cleaned up and painted. Cheaper too.