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Well your gradually beginning to wake up and smell the roses as to what's going on. The wedge depth , arbor end fit and lower lug fit need to be adjusted to one another to establish and maintain a level barrel cylinder gap width around the clock which few people even pay any attention to. The two faces (cylinder and barrel breech) need to be as parallel and co-axially aligned to each other in both axis as is possible to maintain chamber/bore alignment which dictates overall accuracy as well as shot register vertically and horizontally (x-y axis).You have it pretty well nailed. Arbor is corrected and the lower frame makes good solid contact at the lower pins then you have a good setup. You can set the barrel/cylinder gap after the arbor is corrected several ways just depends on preference. I've done it by removing material from the forcing cone area, and in some cases a light skim cut on the cylinder face especially when there was excessive runout between the cylinder and the breech area.
If the arbor is short then the wedge can draw up the barrel gap at the top but not at the bottom as the lower lug blocks it's level/uniform draw up.
This is why any gap reduction must be addressed at all three points ( wedge depth, arbor end fit and lower lug trim).
Maintaining parallel at 3 and 9 o' clock is addressed by arbor thread square just as it is by the threaded barrel frame hole in solid frame guns.
Revolver chamber/bore alignment square is not only important to accuracy but also to shot registry in relation to the sights. Same deal with chamber to bore alignment in rifle barrel accuracy.
The establishment and maintance of barrel cylinder gap parallel is another advantage of solid frame gun design over open frame.
Some lug reduction photos.
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