John Rumm wrote:
On 18/10/2010 12:40, ARWadsworth wrote:
Peter wrote:
You would need to place the metal over something to use as an
anvil, and then centre punch where you want to start drilling.
Failing that, a U shaped notch would probably do as well - couple
of snips with string side cutters, wiggle the tab created until it
fatigues and falls off, then file to final shape.
lamp to sit on, and have the cable exit throug that.


I was going to suggest a slot, but in my experience wiggling to
fatigue the tab is likely to distort the metal that its attached to.

Peter Scott

Angle Grinder.

For once the canonical uk.d-i-y answer is actually pretty good ;-)
Clamp firmly, and take little nibbles to avoid overheating the metal.

Thanks for all the quick answers guys, that's brilliant :-)