A:
Actually I've never used it for rubber worms, only live night crawlers. You pierce the worm near the collar, thread the worm onto the threader and exit the worm near the end leaving some part of the tail free to wiggle. It has a hollow tip and you stick the point of your hook into the hollow tip and shove the worm onto and around the hook and up your line. I find that a barbed hook works well. I use a #6 for trout.