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Homemade High Pressure Pump.

A place to ask general spud cannon related questions.
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Unread postAuthor: Mitchza89 » Thu Jan 24, 2008 10:23 pm

Nah its not that, the groove is on the top nut, not the bottom. I filled the bottom nut a bit too small. The piston off the shockpump wont stratch anything at all, it's polished aluminium.
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Unread postAuthor: Hawkeye » Thu Jan 24, 2008 11:01 pm

It makes far more sense to groove the bottom. The seal is formed on the down-stroke so it will work more reliably if the o-ring seals on a continuous surface. Otherwise the piston will seal when you pull the handle up. The air will still leak past at the top of the stroke but why fight a vacuum?
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