for those of you who have made them what are you using for a spring?...what about for a ball? the only spring i could find was out of a bic pen ,and the only ball i could find was a bearing out of a swivel wheel....it works fine for now,but i cant get it past 10lbs of boost,stock is 6 and a spike of 8.3,fuel cut out is at 12lbs(for now!!)so ten will work for the time being

"Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but STUPID lasts forever."-Aristophanes. --93 pgt,headers,intake,borla=14.9 1/4mile