So a while back I picked this bass up for a little over 500. Not sure on the brand but the closest thing I saw online is a kasuga? I decided to swap the pickups for a bartolini rt6 in the neck and a Seymour Duncan srb-1b for the bridge. However, the neck pickup needs to be routed out more and the back pickup needs to be widened just a hair. Upon further inspection it looks to me that the wood that needs to be removed is part of the neck? Is that possible? (See first pic). Also, I noticed that the saddles are set weird. The E and A are facing one way and the D and G are facing another. Doesn’t seem right to me. And last question is about the knobs. Barely turning the volume knobs either cuts it off completely or cranks it. Is that a wiring problem or a pots problem. Any and all help regarding this bass is greatly appreciated. Thanks!