Holley Needle and Seat Repairs Pg. 4
Carefully place the needle & seat back into the float bowl taking care not to damage the o-ring as it slides in. Push it down just until the threads are ready to meet.
Next, place the larger gasket in place. This gasket seals the bottom of the adjuster nut to the top of the float bowl boss.
Next, place the adjuster nut on to the needle & seat. Note that there are two corresponding "flats" machined into both the nut and the needle & seat. Make sure they engage properly.
