I wanted to use a Tru Turn for my Funtana, but was surprised how much weight would be gained by the adapter nut and washer they want you to use to hold it on. The Saito comes with a smaller nut and locking nut that weighs much less when added to a typical 2.5" or 2.75" plastic spinner.

The Tru Turn spinners themselves are very thin aluminum, and light, but the ones my LHS has are already cut out for props that are nothing like the wide blades I run. I didn't want to wait for a special $30 spinner to arrive when i have a choice of 2 shiny plastic yellow lighter alternatives: Goldberg and Dubro.