I purchased an older non-Fender neck that had this Fender d-tuner / extender tuner on it. i've hit Google Image searches pretty hard but I'm not finding anything exactly like it anywhere, so I'm guessing not super common. It's obviously very much like a Hipshot BT-1 or BT-2, with the big screwhead in the center. But it's not exactly a match to the current ones. For example the worm gear works through two pieces that don't really match the Hipshots. I'm sure it could be a relabeled Hipshot and that they've updated the construction a bit. Does anyone know any of these questions. 1. Is there a difference between a "DTuner" / "Detuner" / "D-Tuner" / "Extender" / "Drop D Tuner - 2. Are they tuners / tuning machines / tuner keys / tuning keys? 3. Did Fender ever make their own? 4. If so - what years? and probably the real answer I'm looking for 5 What year was this made and if I'm searching the internet or Talkbass trying to find a photo of one what do I search on exactly? Thanks!