A bbq or any metal container with something like this:
[video=youtube;POYB52OUm4c]http://www.youtube.com/watch?v=POYB52OUm4c&list=UURdd L3mkjOvJ3tAtVHpW-XQ&index=4[/video]
Will do the trick, it does for me anyway.
I stopped using charcoal briquettes on the advice of Dave Budd and now use wood ( hard wood ideally) instead and the results are much better, being easier to control and quicker to heat the steel. He also advised not using the hot air gun in favour of a hair dryer but I realised that I could use my workshop vacuum cleaner set on "blow"!, works a treat and uses a lot less power
( Cheers to Dave
)
If you can get hold of some old 6 or 8mm "long" allen keys, they make a good oval or "tear" shaped striker and you can also flatten them out a bit if you fancy.
If you've got any questions or need any advice, just drop me a pm and I'll help if I can.
good luck
Steve