I was going to buy one of Cabine Tree's Locking handles, and Veral Smith suggested a hose clamp over the handles. I got my 2 brain cells bumping together and came up with this. Before, by holding the mold with my hand, I was getting a 5gr weight ES. With this, I lowered that to 1.2gr with only 4 rejects out of 62 boolits with a preheated mold. Have a look and see what you think. I used 2 o-rings secured to one handle with a coax cable clamp and then super-glued a flap of leather around them for a tab.
http://i11.photobucket.com/albums/a1..._98/O-ring.jpg
Ian