The internal threaded lock rings will need a tool to unscrew them. I make them to fit various scopes by using hacksaw blades and wooden dowel. They're like a spanner nut, and have a notch on opposing sides.
I cut the hacksaw blade to length to span the two notches. Then cut a notch in a wooden dowel, and epoxy the piece of blade into the dowel. Then just slip it into the tube and unscrew the spanner nut.
I've made enough different types that I can take most scopes apart with the ones I have here.
