Below are some off-cuts of very thin brass, left over from scissors I purchased from DollsHouse Mall. Unfortunately there was not a long enough piece to go around the glass dome so I had to cut two pieces. I used a very small hole punch to make three holes in the brass strip. The really tricky bit was working out the distance between the holes. Mathematics was never my strong suit so it was a matter of luck. I guess if I measured the circumference and divided by three that would have worked. The fact that I had to overlap the two brass pieces complicated things!
If you look closely you will see the lamp hanging from the ceiling , which isn't there yet!