Miscellaneous Technical Subjects
There is friction in the roller jewel and fork action. In order to reduce this as much as possible, the very smallest amount of oil placed in the fork has been found to help maintain a steadier rate after the watch has run for several months.
In order not to get too much oil on the fork use a pointed peg wood moistened with oil. Place the peg wood at points as outlined in the drawing. Under no circumstances put oil on the jewel pin or on the horns of the fork. Do not get oiling at this point confused with the method as used in oiling. the train or balance jewels, as very little oil must be used in fork, whereas the balance of the watch must be well lubricated. The inside of the fork must be moistened with a little oil.