What is the Shim Pickup and what does it do?
I developed the shim pickup with a thin piece of ferrous shim-stock around the outer portion of the coil to retain and confine the magnetic field within close proximity to the coil to brighten and tighten up the sound of the pickup. The grounded shim acts as a magnetic keeper and acts similar to the ferrous bridge plate on a Fender Telecaster. This also keeps the magnetic field from straying towards the height adjustment screws and makes the pickup more efficient in relation to the coil, magnetic field as a unit.
