On 18/10/2010 13:05, 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.

For once I agree, but mark where you want the hole to be and very gently
use the angle grinder to make a small light cross on the curve. This
will act as a scribed mark for the drill to bite. Start off with the
smallest twist drill you have, to avoid wandering of the tip.

Good luck.

Dave