If you're cutting anything magnetic the chips stick really bad but if you want an option to get around this, try the following:
Use ejector plate return springs and place two of them in between the parallels to keep them snug against the jaws under tension at ALL times... It also allows you to open the jaws, blow out the chips, oil or coolant and change the part without the parallels moving even a smidge!!
It can't be beat for production work if you don't have machinable jaws~
EXIT 85 Manufacturing "The best custom wheels, period" (www.exit85.com)
Experts in low volume, highly complicated, one-off forged aluminum wheels