Thanks, unless the book has detailed line drawings it won't help. The drawing he shakily held in hand in the vid is exactly what I need, not a how to. I have that cold. I couldn't even get a screen grab of the picture and see anything with clarity. I need outside diameters, like the collar, outside at the back, length from the collar to the rear edge and thickness of the collar.

Someone must have a barrel they can measure and share info...?