Oh dear. ;-) I tend to use a jigsaw for this sort of thing, with a blade
snapped off to the maximum depth of cut I need. Slower than a circular
saw, though.

This sounds a bit dangerous actually!

Whadya think of the router option to cut the board away from the nails?

Why not get one of these, it's on my soon to be bought list!

http://www.armeg.com/electrical-sbccablerod.php


SJW
A.C.S. Ltd.