RE: Eflite Power 46 BL
I have a Himax motor of the same size. Never liked the spinner type nuts on these things as you can't get them tight enough. Replaced mine with a regular nut that you can use a wrench on. Also sand the shaft with emory cloth or sandpaper lengthwise to the shaft to rough it up and give the collet something to grab to. Tighten the nut really well. Never had one come loose.