Atlas offers Commonwealth Trucks (#66029), I bought a pair to replace one
damaged in shipping a 53' 6" wood express reefer.
The replacement truck would not fit over the post on which it pivots.
It was no problem to sand the outer diameter a little until the truck
would fit.
That was/is not the right way to handle this small problem. I talked with
Bill at Atlas and he told me when painting the trucks, some paint may make
the hole a bit smaller, usually at the top and bottom. Scraping it off with a
pen knife would solve the problem in a better fashion than sanding the post.
Another 'live and learn' in our hobby.
John in Lansing, Ill