Crain 635 OPTO Electric Carpet Stapler KitThe Crain 635 Opto Power Tacker has a ruggedized electronic control board including an optical sensor that fires in response to the motion of a tough sliding trigger. The delicate mechanical microswitch of previous tackers, which frequently required repair, has been eliminated. This tacker also has a long, slender nose that more easily parts yarns to penetrate down to the carpet's backing. The short overall height, narrow profile, and rounded cap