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CHANGE BALANCE WHEEL (Cont'd)
"slow" positions with movement in the crown down position and
viewing from front frame. Sight the regulator loop and view the
position of pallet lever. With index finger on rim of balance
wheel, if the fork of the pallet lever is pointing inwards, rotate
balance wheel to the left to engage the impulse pin with the fork
and to bring the tail of the hairspring up to the loop of the reg
ulator and hold with index finger on balance wheel. If the fork
of the pallet lever is pointing outwards from the movement,
with the index finger rotate the balance wheel to the right to en
gage the impulse pin with the fork and bring the tail of the
spring up to the loop of the regulator. Using tweezers as stop
against balance wheel if necessary to position tail of spring.
With right hand tweezers guide tail of spring through loop or
grasp tail of spring and thread through loop if necessary. Hold
movement with crown down and front frame towards you. Apply
slight pressure on rim to stop motion of balance wheel and line
up tail of spring with bracket, check visually position of impulse
pin within fork, with right hand tweezers guide tail of spring
into the hairspring bracket hole.
Position bend of hairspring on rim of bracket hole and
using right hand tweezers grasp hairspring wedge pin and re-pin
hairspring.
The balance end shake is then finally adjusted.
NOTE: The detailed explanation for pinning hairspring is
necessary to ensure that the impulse pin engages correctly with
the fork just prior to pinning on hairspring brackets. If the im
pulse pin is outside the fork slot, the hairspring must be unpinned
and detailed procedures must be carefully followed. If this is not
done and it is attempted to force the impulse pin into the fork
slot, this will result in damage to the pallet lever and pallet pins.
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