Graph Tech Ghost - Manual (Page 31)

31
In some installations, you may have to drill a hole to route the
wires between cavities in the instrument to pass the pickup
wires through. This hole will have to be large enough that the
connectors on the pickups can be passed through easily. We
recommend 5/16” diameter. Be careful that the drill chuck does
not scrape the finish of the guitar while you are drilling this hole.
Drilling between control cavities
Drill
between
cavities
Do not scratch guitar
with chuck !