Thanks for the suggestion Colin. I had wondered about concrete but was concerned about getting it into such a narrow opening - if I don't get it solidly packed in before it sets then I guess there's a danger of it having weak points where bending could still occur. I could try a sample piece...
Thanks for the reply Jack, most helpful and very well explained. I will definitely look into the steel strip idea - the span I'm looking to cover varies but the longest is around 190cm, the shortest around 150cm.
Thanks again.
Thanks for the suggestion Bernard. I'd assume something wooden would also have a slight bend, but I suppose if I can find a piece that fits snuggly enough inside then that could definitely work. I'll have a look to see what I can find this weekend.
Thanks very much.
I'm attempting to re-purpose some copper pipes I have to make curtain rods. I like the exterior look of the copper but of course the downside is that copper is rather soft and bendy. Does anyone know of anything I can use to go inside the copper pipe to give it more rigidity? I'm using 15mm...