180. The idea of the tool is, the
screw head _f_ rests in the sink of the cap jewel or end stone, while
the other blade rests on the cock over the balance. After the adjusting
screw to the caliper is set, the spring of the blades allows of their
removal. The top pivot _z_ of the cylinder is next cut to the proper
length, as indicated by the space between the screwhead _f_ and the
other blade of the pinion caliper. The upper pinion _z_ is held in the
jaws of the cutting pliers, as shown in Fig. 177, the same as the lower
one was held, until the proper length between the lines _d v_, Fig. 171,
is secured, after which the cylinder is put back into the cement chuck,
as shown at Fig. 178, except this time the top portion of the cylinder
is allowed to protrude so that we can turn the top pivot and the balance
collet _D_, Fig. 171.
The sizes we have now to look to is to fit the pivot _z_ to the top
hole jewel in the cock, also the hairspring seat _D_ and balance seat
_D'_. These are turned to diameters, and are the most readily secured by
the use of the micrometer calipers to be had of any large watchmakers'
tool and supply house.
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