I'm all over the map with deciding on pickup(s) for an upcoming bass build, haven't decided between J or P types or Nordy Big Splits. I'd like to demo some various options. Going one step further than choosing a particular pickup, has anybody here built a rig for testing various pick-up locations? I've got an old Warmoth mahogany J body and would like to hear how different pickups sound in different locations before I have the body routed. I remember seeing some kind of guide rail contraption here or on a guitar forum where a pickup could be temporarily placed upside down over the strings and moved closer or farther to the bridge or neck - does this sound feasible and/or useful? I guess it could be tough for the right hand to pluck/strum if the pickup is in the way.