Lots of questions tonight...
The old cooker hood in my kitchen has a 4" hole at the right height, and about as far left as I can possibly have the new hole if I'm having a chimney hood.
Modern cooker hoods appears to want 5", or more usually, 6" holes.
Is it possible, using a core drill, to drill over the the top of an existing hole? Or is it going to wander so far that I end up with a complete mess? Obviously I'd need to offset the centre at the same time, so that the left edge of the hole didn't move any further left.
Never used a core drill, no idea if this is going to work or not. The alternative is to find a hood that takes a 5" hole and use the 5"-4" reducer I have hanging around in the garage.
Ben