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Agreeing with what many in here would say...that one should just keep some bic lighters with them...something like this is just for 'playing'; Whenever any of us want to understand something like a...

https://en.wikipedia.org/wiki/Fire_piston

A side thought I just had: I've noticed that sometimes when a person pulls the piston back out, the tiny ember can pop off of the end, which either ruins...

You'll probably get some better information from others than from me, but...whatever else, it needs to have an adequate compression ratio. Some sources say 18 to 1, and some say 25 to 1. However,...