I made a mistake! I was winterizing my 50 hp Johnson outboard, and accidently opened the wrong screws! After opening the correct upper screw to drain gear oil, I didnt see the drain bottom screw so far down below, and opened the shift cradle screw instead. I reviewed the owners manuel, and it says "IMPORTANT- do not open shift cradle screw while draining" I went ahead and opened correct lower screw and drained the rest out, then put all of the screws back in thir proper places, without re filling. Have I done any damage? Whatshould I do? Why does the owners manuel say it's important not to open that screw??