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You can attach that knot to pretty much anything you want really.

The only two restrictions are that you don't want to use something that would fall apart, and you have to use something that has a...

Not that you need to hear it again, but you can add my endorsement of thegoldennib.com

I purchased an 18mm knot from them to restore and old brush that came with a scuttle I bought off ebay, just...