Hey Rick,
Back in the day when I was tying on a NorVise, there was no material clip so I developed a way to attach a material clip and showed it to Al Long, former owner of Kamloops FlyShop, who in turn took it to the Calgary show and it was an instant hit.
Simply take a spring and pass a zapstrap through it and attach the zapstrap to the front of the mandrel behind the jaws, tighten it down and voila!