I can't speak to that era other than to say "In General" they liked things like C clips and 'wavey' or spring washers 'back in the day'. Sometimes pushing or pulling against the spring washer while twisting to get the barrel to line up with a notch in the door allowing the barrel to slide out is a solution.

The engineering used usually had a 1930's quantity of "Common Sense" about it that oft eludes Us more modern types...


Give me ambiguity
or give me something else