Patrick, good advice which I would follow but using these VCs sort of negates that possibility:
The VCs and their bolts have already cost me an afternoon of work on it as one gauled in the other head after being run in finger tight. Seriously, finger tight. When I went to remove it, it rotated about 2 turns and stopped refusing to turn in or out. At that point I had to twist it out and hope for the best. As I twisted on it with nothing but a T handle it sheared about 10 threads up from the head.
Notice that my T handle is fine. Now I'm not what you would call a small guy but it really didn't take much torque to twist that little POS in half. Uh, I mean thirds, when I tried to get what was left in the head out it sheared again, right at the level of the head, forcing me to drill it out and heli-coil that hole.
I figure these things are made of stainless peanut butter and I'm now looking for something to replace them. Just in case anyone wondered, these are what came with the VCs.
Steve