My Venturi Bolt is coming Loose!!!!!!

[PMI-Xtreme]

something is wrong with my Piranha STS VF G3. when i shoot it the venturi bolt the little screw in part with the holes in it comes loose. and eventually it unscrews almost all the way and i can't even shoot a ball out. HELP!!!!!!!
:paranoid:

[Nitro]

DONT TRIPPLE POST PLEZ