Abstract: A tool for driving fasteners into a workpiece includes a fastener supply device removably attachable to the tool and supplying the fasteners to the channel, and a workpiece contact element. There is a first alignment mechanism on the nosepiece and a second alignment mechanism on the workpiece contact element. A threaded adjusting member located on the workpiece contact element and a threadable adjustable mechanism on the nosepiece are configured engage with each other, such that movement of the workpiece contact element due to rotation of the threadable adjustable mechanism causes the first alignment mechanism to engage the second alignment structure. The tool has a sensor held by the housing and a detector within the fastener supply configured to sense the length of the fasteners and communicate the length to the sensor.

Abstract: A trigger assembly for a power fastener driving tool having a housing, a control valve mounted to the housing and a reciprocating workpiece contacting element associated with the housing, includes a trigger member being pivotally engaged on the housing and having a pair of spaced walls, an actuation lever having a free end and a pivot end pivotally engaged on at least one of the walls, the free end being constructed and arranged for engaging the workpiece contacting element, and a biasing element for biasing the lever and the trigger away from the valve. At least one of the walls are configured for receiving the pivot end and for defining two positions for the lever, a first position which places the free end farther from the workpiece contacting element, and a second position which places the free end closer to the workpiece contacting element, and the lever being selectively positionable in either the first position or the second position and being held in the selected position by the biasing element.