Drilling both sides of tube:
Measure the total diameter of the tube.
on a piece of paper, mark two points--one point at random and the other
point, mark it from the first, exactly half of the diameter of the tube.
That gives you two points on the paper, separated by the distance of the
radius of the tube.
Wrap the paper around the tube.
Place one of the points at the intended hole location. Mark it.
Holding the paper steady, mark the other point on the other side of the
tube.
Drill both points from the OUTSIDE of the tube.
Very cheap and easy, even up on a tower.
de K4VUD
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