oh you mean those "patch pullers". I looked through the cleaning section of a large mail-order (no not that one) supply house the other day. While they had some tow worms, it's obvious they don't really know why.
I'm now balling this up more than winding it onto the worm and it's just easy fine no problem. Once you get your "balls of tow" established, then they pretty well stay together for cleaning and reuse. I just keep the oily ones separate from the watery ones. Wish I'd learned of TOW cleaning years and years ago.
Patches are for shootin'!
I ran across a deal on tow, I have a full lifetime supply, so long as i don't lose this _half pound_.