re: Fire Piston

Thank you for all the nice comments !!
Hi Tony, it is used to start a fire if you have no matches or lighter. Just drop that burning charcloth into paper or tinder and  it lights up quickly,
Hi Dave. I did not mention that inside the cylinder I have a piece of copper pipe with a plug soldered in the end for a complete seal. I use that because it is smooth on the inside with no seams. Just having a hole bored in wood would  leak  air into the pores and may not work at all.
Cheers, Jim