Leave it alone, it is supposed to be that way. It says so in the instructions that come with the unit. The smaller opening is supposed to cut down on the moosing acording to the documents that came with the unit.
Bob Johann
SoundQ SVT
1998 T-Red SVT Contour #3088
2001 IASCA Pro Street 1-600 Champion
2002 SLAP Pro Street 1-600 Champion
2002 MECA SQL Master Class Champion
2003 IASCA StreetX 1-600 Champion
2005 SLAP Expert Street Champion