Hi I am in the middle of installing an impeller kit on my 2005 60 hp Mercury outboard.My question is ,why can't I put the gear box in neutral or reverse on the work bench? There is a splined rod sticking out of the gear box next to the water pump cover and it will turn about half a revolution in either direction but doesn't do anything.It worked fine with the engine running last fall.I installed kits in both of my honda 4 strokes last spring and I had no issues shifting them through the gears on the work bench.Its my first Mercury out board.Any input would be greatly appreciated.