Nice work making that!
I reamed out the bearings at the weekend. The first side took ages as you can't measure across an adjustable reamer as there are an odd number of flutes. Adjustment was 1/5 of a turn at a time until the pivot pin fitted.
I marked the reamer then backed off the adjustment for the second arm. As I knew where I wanted the final size of the reamer to be, I could take bigger cuts.
Arms are fitted but I need to sort out the handbrake quadrants and pivot pins. I am staying back at work to make a wee mod to them which should stop them seizing up.
Another problem I am having is trying to find all the parts. Why have I only got 4 brake back plate bolts? I'm sure all 6 went in the same box when I stripped them! I think the mice in my garage are taking the piss.