They sell this cool device called a 'Louisiana Ball Crusher'. It's your basic steel ball collar/stretcher, except that it has long wing-nuts on either side attached to a sort of bar. The idea is that you tighten the wing-nuts and the imprisoned testicles are slowly squeezed.
And, as if that weren't enough, the bar has a small eye-bolt in it for the attachment of weights, a leash, etc.
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