Ah yes... the uni-knot trick... conceptually the monofilament version of the barbed shank on old school bait hooks.

And yes a substantial hangback would be the objective.

I would imagine you would thread/slide the worm down the leader all the way to the hook, then tie in the uni(s) a couple inches above the head, trimming a bevelled stubble on the front end of the uni and trimming flush on the back end of the uni. Now just slide the worm back up to capture the uni(s), then slide ever so slightly back down to seat the "barbs".

Never done it that way, but just curious how often a single uni gets the job done. Seems like you might need more than one if the "pre-drilled" lumen in the worm fits a bit loose.
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