I have had the same problem. I have wrapped rubber bands behind the judo, but that was not a very impressive solution. For compatibility with my 175gr setup, I use a Judo Kondor (the big judo)... and then I take a full-size rubber blunt (the black one that slides on), drill a hole in the business end, cut it down with a sharp knife until it makes weight, and slide it on backwards behind the Judo. May sound a little grotesque... but it works and I've been using them this way for a long time.