Vacuum clamps - looks neat, but a bit costly. I guess I just need a few more clamps of different sizes, a few DTI holders and keep doing what I was trying before. I do often use a V-block, clamped to the surface, with a round rod clamped in the V and a DTI on the end. Not very flexible, but a full blown, even miniature mag base cannot be clamped / won't fit in the tight spaces due to the length of the rods.

Regards,
dsc.