It achieves nothing. Shaft length 18.25mm, shaft width 3.4mm. Head Width 6.75mm. Overall length 20mm. For example;.
Set of 6 Guitar Pickup Height Adjustment Rubber Spacer Tubing
Epiphone P90 Dogear pickup height adjusting shim/spacer
Roswell P90 Dogear pickup height adjusting shim/spacer
Set of 1mm, 2mm, 3mm Epiphone P90 Dogear pickup height adjusting shim/spacer
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Stew Mac USA #3355 Humbucker Pickup Height Springs X8 1-5/8”
