Step 1: A Local Watchmaker
- Spanner wrench to remove the back
- Ballpoint pen or jeweler's screwdriver to depress the stem lock
- Canned air with a guide tube
- Rubber cement or a properly sized "O"-ring
Step 2: A Really Bad Idea That Worked
*Those who know say dirty watches are apt to run fast, even though that seems counter-intuitive. Mine was running slow.
**After posting this Instructable, I found and read some articles on quartz watch problems. One article suggested the very thing I decided to do in this Instructable, which is to blow out the movement with compressed air in order to remove loose debris from dried and flaked oil.
Step 3: Take the Movement Out of the Case
Lift the plastic retainer out of the watch case and depress the lock that holds the stem in the movement. The stem must be pressed inward as far as possible. The locking piece disappears when the stem is pulled outward without releasing the lock. On Seiko watches the stem lock is very often a springy piece of metal near the stem and it has a small hole in it. Look in the photo near the end of the toothpick. See also the second photo. Push downward on the piece with the hole while pulling the stem out of the watch case. A ballpoint pen works well enough for this, or you may use a jeweler's screwdriver. A toothpick splinters and leaves debris in the watch case.
Step 4: Canned Air
(When assembling the watch in its case, do not force the stem through the case and back into the movement too hard. A little pressure is needed, but too much may mean something is not properly aligned or installed in the proper orientation.)
Step 5: Checking the Results
*The black clock faces indicate it was dark in those parts of the world when this photo was taken. The clock faces are white during hours of daylight in the respective parts of the world. Still, the second hands on these clocks are easy to see.
Step 6: Gasket
"O"-rings for watches are available from Amazon and from watchmaker's supply houses, like Esslinger. Some are sold in assortments and some individually. Unfortunately, Seiko uses part numbers rather than dimensions on its "O"-rings and I have not found a key to the numbers so I can order the right gasket for my watch. The Esslinger site also has some tutorial information for the amateur.
The graphic is a depiction of an "O"-ring, including a cross sectional view. The diameter of the material and the internal diameter are the key measurements for a watch back.
*The gaskets that seal various parts of a watch degrade over time and need replacement periodically.
Step 7: Bonus: How a Quartz Watch Works
The photo shows the inside parts of a common, inexpensive quartz clock movement. The little can is the quartz tuning fork. The copper coil that is part of the stepper motor is also visible, as are the gears that break down the motion of the second hand for minutes and hours. The micro-processor is on a small circuit board inside what you can see, as is the rest of the stepper motor. (I once did an Instructable on modifying a quartz clock movement with a switch for timing oneself during public speaking.)
This is one of my very few adventures in watch repair. I know nothing about watch and clock repair. There are forums on watch repair on the Internet. Please take your questions about problems you are having to those. There are also books available for sale or in your public library on watch repair.