Barcus Berry 3100 - Manual (Page 6)

Installation
The transducer is furnished with two Phillips-head
screws which are employed to secure the pickup to
the bridge of the instrument. Back these screws out,
if necessary, until the transducer can be fitted over
the edge of the bridge (on the G-string or C-string
side). When properly oriented, the notched portion of
the pickup will be at the top (embracing both the front
and the rear faces of the bridge) and the cord will be