Hi Pete, I'll try and explain it as best I can. It uses a piece of plastic conduit, about 20mm dia. and 6" long. A chamfer is taken out of one end so 3" of the pipe is like half a tube, a chanel. A slot is cUt in the end about 10m deep. The hook is put into this slot and the trace passes through and out the end of the pipe. In the article it was held in there with a rubber cork. Now you just pack your shellfish, tuatua, cockles whatever, fiddley little things, around the hook. This is easy 'cause all the hook is exposed, and held, and you're holding the end of the pipe. When you think there's enough you bind it on with bait elastic. Cotton doesn't work. Wind the elastic around the hook, bait and pipe. When it looks good, undo the cork, slide the hook out of the slot and as it comes free the elastic tightens on the bait. Probably easier to make than describe. It was in a fishing mag 10 - 15 years a.go. I'm certainly going to try it.