this gave me a reason to open the barn door. this is the best I could come up with calipers. I would not use my numbers to machine by, but might be able to match a standard part.
I would question if the piece could be forced around with the bar in place. I would think cutting a notch in the bracket to allow the lip to enter would be very benifical.
that is going to be a hard area to get your hands in to work.
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