Thanks John
. I go on-line and do a Google Search for "brass wire" and then refine the search with the size I need. There are always numerous sites offering it, I get most of mine through Ebay. The sizes go from 0.1mm up to "whatever".
Sometimes brass ROD works better, as it's a lot harder than wire and doesn't bend as easily for Masts etc. Tubing is also available in sizes from 0.3mm OD up.
Cheers, Danny