I recently swapped my Rickenbacker 4003's bridge pickup cover assembly for a chrome plexiglass pickguard. After putting it all back together in the order referenced at http://www.rickenbacker.com/pdfs/bpickups.pdf (minus the stock horseshoe, obviously) the output of both pickups is considerably weaker than before. I figure this has something to do with the grounding, but I'm not sure exactly what to do. Any help is appreciated! Thanks!