They still make an injector for worms. It,s a little squeeze bottle with a needle in the end. To by pass this why don't you just try floating jig heads they do the same thing and aren't that expensive. Instead of injecting most walleye Guys use the floating jig head. If your going to use a lot of worms on the hook get yourself some small styrofoam bobbers that you can peg on the line just above the hook. This will keep your bait up off the bottom.