Joe made his tester to work with Fisher-Pierce control heads, the type used in Grand Teton National Park where he works, but ... (NPS 2-61-31, Tester to Check Control Heads on Street Lights.) ... hole Guard railing POST DRIVING PLATFORM N Plug Fishera Pierce control head As the photograph and diagram show, ... The A-frame mentioned has a removable shaft and reel gadget for wire take-up and payout, as well as a pulley to facilitate post removals. ... NUMBER 2 11 PLOWBACK.