Technical Data T. D. 104 Hamilton Watch Company Size 12 Jeweled Motor Barrel

Technical Data Hamilton Watch Company

LANCASTER, PENNSYLVANIA SUBJECT: Hamilton 12 Size Jeweled Motor Barrel

T D 104 500-2-26-30

1000-6-15-36 500-5-5-30 1000-

5-26-37 2000-8-10-32 500

-9-22-38 1000-5-25-35 1000-

9-27-39

There are two styles of barrel arbors to be found in the 12 size Hamilton models. On the 900 and 920 models the arbor is held in the barrel with an arbor nut. On the 902, 904, 922 and Masterpiece models the barrel arbor is fixed friction tight and riveted secure to the barrel. It is not necessary on either model to remove the arbor. Neither is it necessary to remove the barrel top jewel from the ratchet wheel.
The Hamilton Jeweled Motor Barrel can be taken apart and assembled in the following manner, performing the operations in the order in which they are given:

1. Take out barrel bridge screws.
2. Remove barrel bridge and barrel complete.
3. Hold barrel bridge in left hand with thumb
and second finger. Support ratchet wheel with first finger. (Protect ratchet wheel with
chamois or soft cloth.)
4. Grasp barrel with fingers of right hand.
Turn barrel quickly towards you. Pull
barrel and barrel bridge apart.
5. Hold barrel bridge in left hand, same as
for operation No. 3.
6. Grasp barrel hub with brass lined pliers.
Turn quickly towards you and unscrew hub.
7. Remove barrel head and mainspring.

After cleaning, it must be assembled in the following manner
1. Wind mainspring into barrel.
2. Oil mainspring and fit barrel head in place.
3. Oil barrel bridge for ratchet wheel and hub.
4. Place ratchet wheel in place on barrel
bridge and hold with first finger.
5. Hold barrel bridge in thumb and second
finger.
6. Use brass lined pliers and screw hub in place.

7. Hold barrel bridge in left hand and barre in right. Bring barrel bridge and barrel together, with a slight pressure on the barrel, turn it quickly away from you, it will snap easily into position. This will complete the assembling of the Jeweled
Motor Barrel unit.
8. Place in its position in the watch.

Care should be used, however, when snapping the barrel into position on the hub and bridge, so as not to break or chip the barrel top jewel.