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A scale drawing of 1:1 was developed of the broken arbor as it was positioned in the movement. Using a pair of calipers I was able to determine the length of the replacement arbor (actually just an elongated pivot with a squared end upon which the lock/release lever was attached). The deficiency of this design is the fact that the arbor is too narrow for its length and therefore susceptible to any undue stress or blow to the lever from careless touching. I understand the reason for the design since at this point in the train, very little friction is needed to jam the wheel so a larger diameter pivot would present frictional problems.