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Hi
Thanks for the tips, did all that. As I said, it think it was a small burner for the size of the metal, just losing too much heat.
I did a test with regard to cleaning. Brushed one side a bit less than the real thing, completely filed off the surface on the other side.
When I heated this small piece, the rod melted and flowed nicely, no obvious difference between filed or brushed.
I noticed that if you do catch the rod in the flame, the surface goes grey. I assume that it is oxidising.
Philip
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