How come my MBC ball won't seal?

[compass]

I built my own MBC, from the DIY page. And tested it before I put it on the car, so I know how much it should blow at the right PSI. Well my ball bearing is not sealing. It should seal untill 14-15 PSI then bleed through, right? I would like to set it before I put it on my car, well it dosn't. I built it to the specs off this web site. http://www.geocities.com/chmwatson/FAQs/mbc.html. What is wrong, or am I a dumbass?

WTF?

 

[Defiant]

The brass elbow you used for the body may not be drilled on-center. Try another, and look them over before you grab one.
Pre-set it with a Mity-Vac.

 

[bartels903]

Also check the spring length, mine would do that before I got a longer spring.

 

[compass]

Also check the spring length, mine would do that before I got a longer spring.

The longer spring helpped, and I put a small film of RTV where the ball seats. It works great!

 

[Defiant]

Yikes. I hope that doesn't stick shut.