When I?m solo, I rarely use any additional power after reducing the power to idle, abeam the numbers, 1000 AGL, no wind, and flying a traditional pattern. My static idle (on the ground) is set at about 1550. The engine will idle at about 2000 on approach, decreasing below that after or near touch down. My approach speed is 60 until final, then 55 until over the numbers. Question: is windmilling the prop on approach like this harmful to the gear box.