I needed to expand the pickup routes to take the Duncan Designs, and seeing as the guitar has finish on it i took the steady as she goes approach.
240grit wrapped around a glue stick from my glue gun, has a soft enough base that if you slip out of the route you shouldn't damage anything, the rear route is very shallow and i did slip out a few times, especially seeing i was sanding in an up and down motion.
I could of used my Dremel, but couldn't risk it, next time i will make sure i have the pickups ready, and do it before i finish it.