Made a little more progress on the Wilton C0 today.
When I went to measure for the end cap, I was getting different measurements on my calipers. Some were 1.64, some were 1.66, etc. I hunted down 2 Dorman expansion plugs and bought a 1.643 and 1.67 OD.
The 1.643 could be made to work, if the...