DuBro makes a variety of sizes and colors of very nice Spinner-prop nuts. All you need to know is your shaft size and thread.

http://www.dubro.com/hobby/ecatalog/dubro/00001.htm

http://www.dubro.com/hobby/ecatalog/dubro/00052.htm


Harry Higgly has a lot of neat things, and a chart for engine - shaft size - and thread.

http://www.harryhigley.com/index.htm

http://www.harryhigley.com/ShaftSizes.htm

http://www.harryhigley.com/EngineAccessories1.htm


Scale/semi-scale models deserve a good spinner such as Dave Brown Products or another popular brand much over-priced, IMO.

The use of a Prop Spinner-Nut is FIRST CHOICE for all others. Makes life much more simple.