This is one of the problems with pre-cleaning in my view. Since this movement has been through a cleaning cycle fully assembled, you really have no way of knowing what the inside of the barrel looked like originally. I know Rolex is a big advocate of this (as is Tom), but IMO it's simply not needed, and often washes away or disturbs evidence that is useful in diagnosing problems with the movement.
BTW, do you have the dial side movement holder also? It's very useful for hand installation and testing of all chronograph and date/moon phase functions. The moon phase has some very specific checks that need to be done on them BTW, so end shake checks and adjustments...something to look into before you get to that part of the assembly.
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