After you get all the required gears you can go up to it and fix it. There's no way to explain how to fix it as arrange the gears in words, so I would recommend looking it up on you tube!
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It is behind the fireplace on the right wall. You can access it if you manipulate the broken clock by the door.
You are not able to reset the clock in Pokémon Crystal. You can only do this in Pokémon Gold/Silver.
the room with the coo coo clock is the ski lodge
The Ski Village isthe room witha kukoo clock.
Fixing the clock is really easy. Just ask Mayor Hamilton if you can fix it and he will give you the key to the clock tower. Then you just have to go to the clock tower, equip the key and select use. That will fix the clock tower and find you the right half of the Harvest Sprite Quilt. Hope this helped