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Nikon S is old series of microscopes, but they still serve fine nowadays.
This series is known to have a problem with fine focus spur gear being cracked.
Here is replacement spur gear made of nylon.
Replacement is simple and requires a screwdriver and pliers only.
I'll prepare detailed replacement procedure description later, but basically it has few steps:
1. Remove fine focus knobs.
2. Remove cover of the focusing mechanism on the left side (where tension control is).
3. Pull inner axle with bearing and broken spur gear.
4. Place new spur gear over bronze ring on the ball bearing. This requires some effort and more simple to do using pliers.
5. Assemble all parts back carefully.
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