I was reading a 1912 issue of the Railway Carmen's Journal yesterday (yes, I'm a procrastinator,) and I read an article from a carman for the C&NW that tells about blocking and shimming and cutting draft timbers to raise the cars three inches to the required standard height, and then came up with the solution of reversing the top and bottom arch bars. On this particular series of truck (which he states the railroad had several thousand of) it worked perfectly. So maybe those trucks were worked on by this carman.