Barcus Berry 3100 - Manual (Page 7)

at the bottom. While holding the transducer firmly in
place against the edge of the bridge, tighten the
upper screw until it engages the rear face of the
bridge. The lower screw should be nestled within
the recessed area of the bridge foot and when
tightened, its head will engage the rear face of the
bridge just above the top of the instrument.
To mount the output jack on your instrument
tailpiece, remove the screws from the clamp