Patent ID: 7838758

Claim:
A module for removable insertion into a body of an instrument having longitudinal strings, the body defining a transverse cavity extending from a lateral edge, the module comprising: a base configured to engage the cavity as the module travels along an axis of movement into the cavity; at least one pickup secured to the base such that upon insertion into the cavity the pickup is in operative proximity to the strings, the pickup having a first and second electrode; a first ball plunger contact configured to conductively engage a corresponding first contact plate affixed to the body when the module reaches at a first point in movement along the axis and to remain engaged as the module moves into cavity along the axis of movement; and a second ball plunger configured to conductively engage a corresponding second contact plate affixed to the body when the module reaches a second point displaced inwardly from the first point in movement along the axis and to remain engaged as the module continues to move into cavity along the axis of movement.