Not a tool for a Triumph but after making some spacers to mount side screens on a Lagonda Rapier I thought best make a simple tool to aid fitting them. The internal door trim is 5mm thick so the spacers are 5mm from the flat surface to the top of the hat. The spacers will be fixed to the door inner and corresponding holes made in the trim panel. To ensure the spacers are mounted accurately I threaded them so they screw into the nut already in the door and the hole in the middle of the spacer is 9.7mm so the mounting bolts have a bit a space to align. Hope that makes sense.
Turning the spacers 8 in total took the best part of a day with constant readjustment of the tools on the lathe. Rim is 1mm thick top hat is 5mm deep and 14.6mm dia with 9.7mm hole. Hardest part was cutting them off which I did with a hacksaw and the lathe spinning, naughty but easier than putting it in the vice and manually cutting.
Adrian