Originally Posted by Neil Morse
Make two discs out of sandpaper, and mount them back-to-back between the prop adaptor and the spinner back and/or between the prop and spinner back (depending on what's slipping). That usually does the trick. Then you have to carefully hold the prop in the right position as you slowly tighten the prop nut. It also helps to mark the right spot for the position of the prop blade so you can easily see whether it's in the right position as you tighten the nut.
Ok thank you ,i did that and it worked great!!