wrote in message
...
[...]

Thanks for taking the time to give me an explanation, I will try to
find sheet brass, but still don't know where in UK.

I buy Aluminium and Brass sheet from ebay. Last buy was item number
160183295588.
Not cheap though!. Probably much easier to buy a TF801 for a fiver and
dismantle/rebuild the magnificent Gold and silver plated turret capacitors.
There's also a bonus of about 2 square feet of Gold plated, brass sheeting
in there.