If you go to the base, you will see the invention cabinet has a magnet in it, find the key to the lock, then open the door, obtain the magnet then use it to get the spring, which will be iced over.
look on www.Youtube.com
find it
At the Town
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from rookie at the town
Just go on Youtube and type Club Penguin Mission 7 Clockwork repairs.
I have no idea, it's impossible
click the piano that's all you can do
on a psa mission 'clockwork repairs'
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The combination to the lock is key