I use the du-bro prop nuts with my hanger 9 and tower hobbies starters with a standard insert in it and have had no problems. If you tighten the prop nut with a ball driver or small screwdriver (has holes in the tip of the nut for tightening) you won't have any problems of it spinning off during a startup. I had more problems starting my mds 61 the first few times with a plastic spinner than I ever did with a prop nut. The plastic spinner kept coming loose even after I tightened the standard prop nut with a ratchet....went to a prop nut and haven't had any problems since. Bottom line it is a personal preference as to using a plastic spinner or a prop nut I just prefer a prop nut for ease of prop changes (I like to try serval different sizes and pitches) and the durability of them over a 6 dollar hunk of plastic.

Face it if your planes goes in it really won't matter wether it had a plastic spinner or a prop nut on it....your plane still ate dirt!

Madd_Maxx