This is from the Troybuilt Website. This is the method I use and I never have to use Loctite or have a problem with Loose Props, sheered bolts or stripped threads. By the way I have a 3w 70


HOW TO TIGHTEN A PROPELLER


When installing your prop, special techniques must be employed. Just tightening up the prop bolts one time won't do it! You will lose your prop on the second or third flight otherwise! See the video page of a prop coming off in flight!


Proper procedure for tightening prop bolts:
1) Obtain thin steel washers and place them under the heads of the socket head screws. The heads of the socket head screws without the washers will gall the aluminum spinner hub and will prevent full tightening of the socket head screws.
2) Tighten the screws a little at a time. Tightening one screw as much as possible without the others being tight will cause uneven pressure on the prop hub. Tighten one screw some, then go to the screw 180 degrees from it and tighten that screw. Go around and around several times. Don't over tighten so that you crush the prop.
3) Fly the plane for 5 minutes. You can leave off the spinner cone (of course have the backplate in place).
4) Land the plane and retighten all the prop bolts. (Not too tight!)
5) Fly a standard length flight.
6) Retighten all the prop bolts
7) Fly one more time
8) Retighten all the prop bolts. If they don't move this time (they should not). Then you have two options: a) leave it alone or b) remove one screw at a time, put on some very light thread locking compound (not too strong!), and reinstall the screws one at a time. It is not necessary to use thread locking compound, but if you lost a prop before and now you are jaded, this is your extra insurance.
9) Check the bolts every once in awhile, though the prop should never loosen if you followed the above procedure.