John, on the stuck disc, there is a little trick I use to get stuck bolts, and screws out! The action placed in a deep freeze for two or three hours, and while still very cold, try the discs. The steel usually shrinks enough to make the disc easy to remove.

Works in reverse as well! The screws magnum on handguns tend to get loose when the temprature gets below zero. If they are tightened while that cold, they must be cold to get them out as well. Screws backing out in the magnum hand guns, is solved by freezing the gun, then tighening the screws snuggly, while frozen, and when hunting with them under normal tempratures, they never back out!