I had a bunch of those YEARS ago. I think I bought them from Herters. I don't even think they're around any more. They were long-shanked hooks, with a pin and hook soldered on the top. The idea was to skewer the hopper on the pin, secure the pin to the little hook soldered on top...and viola...live hopper for bait.....funny thing is, they worked, too. I have no idea if theyare still available.

Ken