How do I fix the cuckoo clock?

Hint 1 of 5:

You'll first need a key to activate it.  Read the previous question if you
don't have the key already.

Hint 2 of 5:

I suggest that you have both of the goblins try their luck at using the key
on the clock, because one has more knowledge of clocks than the other.

Hint 3 of 5:

Use the spring key on the clock (F), and another key will appear.