I can do Friday, for a few hours, I think...
perhaps a meet up near you
Kai Leingod?
the piston...well
you know I do the demo's in the summer, I got this very small ALU fire-piston for my Birthday, (It's not too great

):
(note where the tinder goes...in the end of the bolt, the one I have has a "cross head" (Phillips screwdriver type) bolt so even less space for tinder!
were talking minute tinder lump 2-3 mm across stuffed into the cross head)
after a lot of struggling and sore hands (the things so small it's difficult to use

) I've managed about 3 embers but they all died in 2-3 seconds(not usable).
The company that made them make it look easy!: check the "cross head" bolt 01:16 (I've tried char-cloth and Amadou) I can't get tinder to "stick to the bolt like that! LOL
[video=vimeo;10216891]http://vimeo.com/10216891[/video]
hmm, I'm wondering if the piston/tinder was warmed before use.
I think partly due to the tiny amount of the tinder you can fit in it. also because it's aluminium, the heat gets dispersed too quickly through the metal...that's my guess anyway.
I've looked for a suitable hex bolt but they are not available around here. anyway the ember is so small and short lived a crowd of people won't be able to see it.
(it's shiny metal though

)
Ok, you live and learn, I wanted to make a bigger, better piston for my demos, started with a piece of copper pipe and a hollow alu tent peg, I've jammed and superglued a pice of wood into the alu peg, and drilled a tinder hole into that, all sealed, all super glued shut!
(A picture to follow)
the copper pipe has an airtight cap, which is also glued shut.
the problem I'm having is getting the piston/tube airtight.
I tried a traditional string gasket(washer) which almost works, but you can hear air escaping, and I've fitted a rubber washer (thanks to
Globetrotter
) and the same thing is happening or the rubber washer moves/slips off.
it's sort of 99% there but no cigar!
I'm thinking of scrapping the hollow peg idea and trying a piece of dowelling. guess what, B&Q had run out....

ain't that just typical!
going to get some elder, and start re-learning the "hand drill" too.