So that inserts with ease all the way? Do you add crazy glue?
It's not as easy as with regular plastics, but it is designed to work with Elaztech. When you push the worm onto it, keep pressure on the worm and it wlll sort of flow on (best way I can think to describe it). Once you've got the nose of the worm onto the surface of the weight, back it off a bit, put some super glue on the lead, then push the nose back onto the weight.
I use Loctite gel, less messy but it does take a couple of hours to dry. This is not something you want to do in your boat out on the water. Do it at home the day before you go out.