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As Aerohart explains of its own device, the user simply puts the tinder – char cloth seems to be the most recommended – inside the cavity at the tip of the removable piston rod, reinstalls the piston back into the cylinder, then firmly and rapidly depresses it.—New Atlas,
6 Oct. 2025 But water doesn’t compress, and the resulting pressure can bend piston rods or crack the block.—Sun Sentinel,
13 Apr. 2023