ORIGINAL: zaboaa
Have a plastic spinner, doesn't seem like I can tighten the prop very good. The plastic spins when I go to tighten it. It goes on an airplane with a cowl so it is hard to hold the shaft to get it nice in tight. I do use a lock nut on it, so will that be good enough? Any suggestions appreciated.
Did not see this in the 11 posts so will offer it to you. Making sure the prop is correctly sized was mentioned. That is important. If you should get the prop hole too big, simply wrap some masking tape around the shaft until all is snug. It works.
Now if you have a spinner backplate that turns on you, normally it is the alum. ones that do so, but this works for plastic also. Make a washer about an inch or so, no fancy stuff, just fold some 180-320 sandpaper (Wet/dry best) and cut a half moon. Then make a cut to fit the shaft. No problem if it isn't tidy.
The washer fits between the thrust washer and the backplate. Face the grit against the backplate and tighten the prop. It works.
One other item to consider is that with so many different spinner mounting items, sometimes one can run out of nut threads about a 1/2 turn before the prop is tight. That can drive one nuts. Another prop washer usually fixes that problem.
Good luck.