Holley Needle and Seat Repairs Pg. 2
To remove the needle & seat, place a 5/8" wrench on the adjuster nut to hold it in place and loosen the set screw with a large flat blade screwdriver by turning the screw counter-clockwise. You may remove the screw completely if you wish, but it's not necessary at this point.
With the set screw loosened, turn the adjuster nut counter-clockwise to thread the needle & seat up out of the float bowl. It will only come up about 3/8" before the threads disengage, but the o-ring will still be providing some resistance. Once the threads are disengaged, gently pull the needle & seat from the bowl.
Here is the set screw with the small gasket, and the adjuster nut with the large gasket.
Be sure you don't lose those gaskets!
