Yes you can use V-Blocks but again clamping of the ball becomes an issue. Also unless the pin or rod is sacrificial it will need to be removed. Not that using a sacrificial rod is a bad idea. This sometimes helps deter drill deflection. There are many other ways to do the job. What needs to be avoided is normal clamping in the vise which will provide only one point clamping on each side of a ball. Not at all secure. Could rig a few things up to make a better clamping arrangement as well as a simple permanent fixture for doing production runs but that turns into a bit of a process.
Enjoy,
Bob
