I've been looking for a more accurate way to drill sets of holes 90
degrees from each other through round tube. I came across these V
blocks with clamps...

http://www.grizzly.com/products/90-V...1-2-x-2-/G9816

I assumed the best way to use them would be to set a fence up on a
press table which centers the bit on the tube, clamp the two blocks to
your piece, then once you do holes on one side you would flip the
blocks over to the next side to get your holes 90 degrees to the first
set. Or possibly use one block and a stationary v-block to put the
other end of the tube into.

Is this the best way to accomplish this, or is there a better way I'm
missing?

Thanks,

Dave