Originally Posted by
fietsbob
.. one more technique , a simple jig , drill a hole , or the 2 in the spacing you need
thru the corner of a piece of angle iron, drill press will get it straight .
then you can use the hand drill on the confined space in the frame.
That's essentially what the J.A.Stein bottle cage drilling jig is. I have one, and it works very well. A right angle drill is a handy thing to have too.