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CHANGE BALANCE WHEEL
Long End Pivot
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Screwdriver
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Balance Screw
Front Frame
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Short End Pivot
By carefully turning the balance wheel (arrow direction),
it should be checked that the hairspring is freed from its contact
with the hairspring bracket and regulator. The balance screw
should then be unscrewed, using a screwdriver with a blade to fit
the full length and breadth of slot. (Care should be taken that
minimum downward pressure is applied to the screw, since any
excessive pressure may result in possible damage to the radiused
bearings of the balance staff.) The balance is now easily removed
by inserting a tweezer and gently removing.
To replace balance — The balance is carefully inserted into
the movement. Long end pivot (hairspring) side must enter
first, by means of tilting, then is lowered into front frame V-conic
bearing. The balance screw stud is then partially adjusted to retain
assembly. The hairspring is then repinned by using the following
procedure. First set regulator mid way between the "fast" and
PLATE VIII
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