passive mid control/tone pot
from stanhinesleypickups.com (formerly has-sound.com):
Midrange/Tone Control for Bass
Mounted on a Push/Pull Switch Pot, this pre-wired control replaces your existing tone control, giving you a Tone Control in the down position and our Midrange Control in the up position. Easy two wire hookup!
Threaded bushing is 3/8"
I'll never get around to this project, so $20 gets it to you in the lower 48.
Warwick Alliance #199 // Golden State Bassists #49
Warwick + Eden =