I used a vv bar when I do tricep work with a suprinated grip. It allows the wrist to be internally rotated a bit, which helps as I have forearm and elbow issues.
Are you using a straight bar (--) to do these? I wouldn't.
"Look son, there comes a time in every man's life when he has to make a decision. Do you want to be big, powerful, jacked, yoked-up, have women everywhere want you and men fear you . . . or do you want to do crossfit?"