How on Earth do I cut small rectangular holes for slide switches?

[donald stringer]

You would be surprised how fast you can file a rectangular hole, even in cast alum. For the width of your slot drill a hole no wider than that. File either way to square it up. I have a square file about 1/4 inch square that I use.It will take about 5 or 10 minutes. The nibbler at radio shack is rated for about 16 gauge material I believe and that of course may be the most obvious choice. For k type power connector they sell at radio shack I drill an 5/16 hole for the rounded end and insert file and square it up until the connector slides into the slot.

[luap77]

Thank you to all of you who replied.

Paul E

[j-pee]

dremel +1
dremel (any brand of "dremel", aka rotary tool)... and a router bit...
first you make a hole, and than you can start routing, using that "router attachment"... and a router bit...

I was stupid enough to make two holes
I could correct the deviation, finally

oh, one more:
I also tried a cutting disk with the dremel, that was a very bad idea the worst in every regard