Abstract: An apparatus comprising a housing, a gearing system disposed within the housing and comprising a plurality of targets, a plurality of sensors incorporated within the housing, a processor in electrical signal communication with the sensors, and a user interface in signal communication with the processor. A method comprising providing a drive system comprising a drive system power measuring and diagnostic system, wherein the drive system is configured to rotate one or more components comprising a plurality of targets, sense the targets with a sensor pair, thereby producing a data signal, process the data signal from the one or more sensor pairs, thereby producing a processed data signal, and output the processed data signal to a user.

Abstract: An apparatus comprising a housing, a gearing system disposed within the housing and comprising a plurality of targets, a plurality of sensors incorporated within the housing, a processor in electrical signal communication with the sensors, and a user interface in signal communication with the processor. A method comprising providing a drive system comprising a drive system power measuring and diagnostic system, wherein the drive system is configured to rotate one or more components comprising a plurality of targets, sense the targets with a sensor pair, thereby producing a data signal, process the data signal from the one or more sensor pairs, thereby producing a processed data signal, and output the processed data signal to a user.

Abstract: A fastener includes a head, a threaded member, and a resilient shank portion interconnecting the head portion and the threaded portion. The shank portion includes a first end adjacent the head and a second end adjacent the threaded member. The shank includes a tubular section having an inner wall and an outer wall between the first end and the second end. The tubular section has a curved axial profile. The tubular section is axially elastically deformed as the fastener is torqued down.