I put them in my pen. I have also thought about putting them in different places with a piece of rod down into the ground so it will spin but they can't move it.
I tried that trick once, but drilling through the salt block was waaay more work than it was worth.
I tried a wood paddle bit and a regular steel bit.
Both didn't care to drill salt easily and lacked length to make it all the way through.
Maybe I could try one of those long drill bits to pull it off.
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