[Sparky67]

Thanks all.

It's an illuminated rocker switch going in the panel. I did consider a toggle switch but decided on the former for aesthetic reasons. Hmmm....

I don't have any real metal-bashing facilities here, not even a vice, so was looking for a reasonably quick method I could use with the multi-tool without damaging it, the panel or myself, too much. I did try an abrasive wheel before posting but it wasn't easy to use and must have clogged as it disintegrated after a short time.

Plan B is now to sharpen a few drill bits of various sizes, drill out as much as possible using a light oil and maybe a tapered hole cutter, then saw and file the rest. Not a quick job I'm sure. Thanks for the anti-clog file tips.

Martin