Fastener Installation Tool Adaptor

A dual positionable adaptor for a fastener driver assembly comprising:

• a guide head having an entry reference surface and defining a fastener opening in said entry reference surface;
• a connector configured to mount said guide head to the driver assembly so that a fastener is drivable through said opening;
• a guide assembly mounted to said guide head comprising a pair of spaced arms having opposed faces, each arm having a first engagement edge and a second engagement edge at an angle to said first engagement edge wherein said first engagement edges are coplanar and said second engagement edges are coplanar;
• so that when said guide assembly is at a first position and said arms capture a vertical member between said faces, the entry reference surface engages the vertical member and each first engagement edge engages an upper horizontal member, a fastener is drivable by said fastener assembly through said fastener opening at an oblique entry angle to said vertical member, and when said guide assembly is at a second position and said arms capture a vertical member between said faces and the entry reference surface engages the vertical member and each second engagement edge engages a lower horizontal member, a fastener is drivable through said fastener opening at an oblique entry angle to said vertical member.