This is what I did to a tip that I have for Bears medium injector. I modified it to fit some of the other brands of molds that I have. I tried to make it to where it can be used on either Bear's or tohre brands of molds. It works fine.
http://i614.photobucket.com/albums/tt226/zbasser/toolsandtuff/5-23-09007.jpg
I did something real similar. Same rotisserie, but I used sheet stryofoam, like the blue stuff. Then took a soldering gun and melted holes in it the size of the handles on my lure holders. Like moto said, looks kinda basic, but it works.