Removing the Honda VLX Seat (VT600C)
The seat screws are between the seat and pillion. There is one cap (allen head) screw on each side (two screws total). I used a long metric hex wrench (purchased as a set at Sears - great tools). In this photo, the end of the hex wrench is in the cap screw. You might have to turn the hex wrench with pliers.
There are more photos of the seat screw and sub-frame in the Sissy Bar Mounting page.