ok, thanks Tex - should be very useful.
Also, I'd like to ask about where I can get a proper lead casting pot - preferably one with a lever and a tap at the bottom. I've done some searching and I haven't yet found a reliable source.

Also, I'd like to ask about where I can get a proper lead casting pot - preferably one with a lever and a tap at the bottom. I've done some searching and I haven't yet found a reliable source.