How do I finish raising the lid on the well?

Hint 1 of 6:

Schwarzy is acting as a counterweight on the lid.

Hint 2 of 6:

Maybe you should try adding a bit of weight to that counterweight.

Hint 3 of 6:

Something really heavy.

Hint 4 of 6:

Like an anvil.  Use it on Schwarzy (F) and the lid will be lifted.