turns out there are low-opening-pressure-cores manufactured by Schrader but I haven't sourced the yet except as part of a large kit

but modifying existing ones is not going well... maybe rip out the spring and use an external spring (or gravity) to close it

Has anyone tried modifying a schrader so that it cracks open at lower pressure?

I have a 1/8 snifter valve that cracks at about 3psi but tire valves crack open about 60... Is it just the spring?

I like the idea of using them as check valves.

I like the way you are thinking!

you could also put the magnets on the bolt, add a coil... put some of the current to use...

Bravo, please do. At some point I can get a better pic... I wanted to chrony that one anyway JSM, on the square tubing, I agree. I was trying to get more air storage without adding height or width to the launcher, but after reading about aluminum and pressure cycles I wasn't too sad when it develope...

beautiful work, I'm looking forward to your next one

My first post here! http://i1356.photobucket.com/albums/q731/Anatine_Duo/anatineduofirst5_zps9153fdf3.jpg I made these back 2002-2003 (before video camera or Chrony), not a lot to go on, just knew that it was possible. Hand tools and a drill. Epoxy. Scrap. Only the blue one is still functional. It f...