nick hull wrote:

I likely will wind up doing some variant on that method, there is a lot
to be said for simple and cheap.

The simple way of marking the entrance/exit of a large hole, as done in
boatbuilding:

Drill a 1/4" hole in the center of the eventual hole in the workpiece at
the desired angle.
Affix a 1/4" dowel to one leg of a compass (the ones that let you clamp
a pencil in one leg make this easy).
Set the compass for the radius of the large hole.
Slide the 1/4" dowel/compass leg into the hole.
The other compass leg will draw the outline of the large hole.
Repeat on other side of workpeice.

Kevin Gallimore


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