Re: Tell me about hex screws
The length of poles:
The length of poles or their mass does play a part in the tone of the pickup. Longer poles do give a fuller and darker sound. With longer poles there is also the possibility of introducing what is known as “eddy currents”. These eddy currents are magnetic fields that project from the bottom of the pickup rather than from the top. These secondary magnetic fields can have a negative impact on clarity, but they can also thicken the sound of a pickup. My experience has been that poles that are flush with the base of the pickup yield better definition and clarity.
The composition of poles:
The materials the poles are made of have an influence on the sound of a pickup such as nickel-plated steel, stainless steel and black oxide. Stainless steel is a poor conductor and the tone of a pickup changes with stainless steel. This is a deciding factor when replacing poles with hardware store screws. The majority of hardware store screws are stainless steel, so the change in materials is often more important than the style of screw head.
Screw heads:
Hex head screws have a tighter and brighter sound than nickel-plated fillister screws. Hex heads have sharp treble, tight bass and reduced midrange presence. Nickel-plated fillister screws will round and darken the sound of a pickup and bass/midrange will be more accentuated and highs will be less present.
Height of the poles:
People often overlook the height of the screws in relation to the strings. They adjust the mounting screws, but not the individual poles. Raising or radiusing the poles to mimic the curvature of the bridge and neck profile can have positive results. If the pickup has two rows of adjustable poles raise the bridge coil poles to get more treble and lower the neck side screws to reduce bass. This mimics tilting a pickup like in Telecaster.
Orientation of the poles:
The orientation of the pickup makes a difference whether the poles are near the bridge or near the neck. Turning a pickup 180 degrees does affect the tone of the pickup and can either brighten and tighten the sound or darken and loosen the sound.
So what to do?
- First adjust the mounting screws to position the pickup at 3/32 on the bass side and 2/32 on the treble side.
- Second measure the radius of the bridge/neck and adjust the poles either up or down to mimic that radius. Turning a pole ½ a turn can have positive results.
- Third if you still don’t get the clarity you want use a dremel tool or a jewelers saw to cut the poles flush with the bottom of the pickup.
- Fourth try a different style screw such as hex head or visa/versa.
- Fifth if you like the tone of a different style screw, but you still don’t have the clarity you want, try cutting the screws off flush with the bottom of the pickup.
- Sixth try rotating the pickup 180 degrees.
- Seventh try a magnet swap.