I've had to diddle around trying to clamp a V block down onto a 2-3-4 block while keeping said collection square to the spindle
Actual use was drilling for a scope mount on a Stevens Favorite single shot. I left the action on the barrel and used a Kant-Twist clamp (w/poly jaws) to hold the action against an angle plate (keeps the barrel lined up at right angles to the action). But I had to use blocks to raise the v blocks high enough for the tang to clear the table (the tang was actually down in a T slot).
So how can you clamp down v blocks onto 2-3-4 blocks and still remain square to the spindle?