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Length of Balance Pivots

Saunier recommends the removal of the endstone to see that the pivot projects enough beyond the pivot hole when the plate is inverted. Remove the cock and detach it from the balance. Take off the balance spring with its collet from the latter and place it on the cock inverted, so as to see whether the cock is central when the outer coil is midway between the curb pins. Remove the cock endstone and endstone cap, place the top balance pivot in its hole and see that it projects a little beyond the pivot hole. Place the balance in the calipers to test its truth, and at the same time to see that it is in poise. It must be remembered, however, that the balance is sometimes put out of poise intentionally. See Poising the Balance.