I should have offered an alternative to the duct tape on the vise jaws.
If you're going to bend up some jaw protectors, add a tab that can be bent down to hold them in place. If you're clever enough and the vise shape allows it, make the tab make a snap fit, not requiring it to be bent each time.
There are also some reasonably priced jaw protectors out there that fit and close down on a hex shape, great for AN hose fittings.