Join Date: Jul 2002
Location: Connecticut, USA
As mentioned, Carvin routes their 7 string pup cavities smaller then standard. However, Dimarzio 7 string pups have a plastic base that can be sanded to fit in the Carvin cavity without any routing.You can sand some of the base plastic material, and then open up the screw holes in the pup a little and it will drop in.
Duncan 7 string pups do not have a sandable plastic base and if you choose to go with Duncans, you will have to route the body.The same goes for EMG's too.