I'll have to measure the barrels.
Windsor chokes are different from everything else I've seen, but this fellow says he just needs an example. In talking with him he is customer satisfaction focused and is on his 3rd CNC machine in 8 years (moved up).
Charles Baltz, Gunsmith. Ashland Fireamr Service. 12233 Washington HWY, Ashland VA 23005 804-798-1232 M, Th, Fri 10am to 6pm. Just north of Richmond,VA.
I'm sending him an example (I have 3 of the original 4 chokes marked |, ||| and |||| ) .
I am in the process of finding a source on rifled material to make a rifled choke.