Originally Posted by
sideoftheroad
The black rings that you are taking about is the reason why I started this post. I ruined the one that came with the plane I have.
The white inserts seem to be softer. I use the Magnum white cone shaped one.
I use this insert on all my models from a 1 1/2" nylon spinner to 4 1/2" aluminium which includes carbon fibre as well. Never marked a spinner yet.