Please just hang that thing on the wall, or at the very most put a 3.5 in the asa and play a game or two. Don't futz with it, change parts, or screw with the internals! There are so few guns left of that vintage in good condition that it really would be a sin if it was damaged or the parts were separated.
Sorry to make assumptions, but it sounds as if you don't have much (if any) experience with gun with this style of operation and of this age. Please, don't experiment with that gun. Get a 2k+ cheapie sniper to experiment with if you have a desire to learn.
Just my .02
...'cause bandaid's stuck on me!