How can I fix the Churnatron?

Hint 1 of 12:

Talk to the cow.

Hint 2 of 12:

The cow said that the missing part fell off of the Churnatron and is probably
somewhere in the barn.

Hint 3 of 12:

What could the missing part possibly be found in?

Hint 4 of 12:

The hay.

Hint 5 of 12:

Unfortunately, there is too much hay to search through it manually.

Hint 6 of 12:

You will need something that might show immediate results in the search for
the missing part.

Hint 7 of 12:

The missing part is probably made of metal, as is the rest of the Churnatron.

Hint 8 of 12:

You'll need something that attracts metal.

Hint 9 of 12:

A magnet.