There are 3 sets of mounting holes on each locknut and 3 types of mounting screws used to mount a locknut these 3 screws to the neck. Depending on the manufacturer you could any or all of these. These screws are used in the 2 centered holes. This was the short and stubby #6, 1/2" screw. You could also use a #8333 which is a #4, 5/8" long screw.
