Thanks for all of the advice.

Orville probably brazed his tubes on, but then he was in the business
of building bicycles and had a hotter torch than I do.

Once I get the holes drilled in the bike frame accurately, I should be
able to clamp one of the EMT tubes to the frame and just drill through
the holes. Then, clamp the second EMT tube to the other side and drill
through the entire works. It doesnt have to be perfect, just good
enough not to spot from 5 feet away. The EMT is pretty forgiving and I
can tweek it into alignment with a B. A. H. if necessary.

Tomorrow is Monday, and that means its time for my weekly trip to the
local HF store. (evil, evil, evil store.. oh, evil cheap chineese
tools...) They have v-blocks listed in the catalog. Crossing my fingers
that the store carries them.

Anyone ever seen anything like them at Home Cheap-O or Lowe's Aircraft
Supply? I've seen one online thats made of aluminum and bolts to the
table of a drill press. That would be ideal I think.

Harry