Drum is stuck

[dmjlambert]

The threaded fitting sizes are the same on the drum-drum master cylinder and the disc-drum master cylinder. On both types of master cylinders the threaded part of the front port is smaller and the flare cone and hole that passes fluid are the same size with no difference between front and rear ports. For the drum-drum setup, the brake line going through the fittings are the same size for front and rear, and those 2 lines go to the drum-drum distribution block. The new Inline Tube brake lines that I have that will be going to the 71-72 combination valve have a smaller tube size for the front reservoir, but the threaded fitting is the same size used on the drum-drum master cylinder. So I believe I will not need any adapter if I use my disc-drum master cylinder on my 4-drum truck.

I don't have the option to trade the new disc-drum master cylinder in as it came from a different store, and I would like to keep my complete pile of disc-drum parts ready for the swap. I have everything I need ready to go except some of the expertise.