Solas rubex prop installation

[TheNootkaRose]

For those that have a Solas Rubex prop (maybe on a Yamaha?), take a look below.
SOLAS rubex HR4 going on a Yammy 225 with the correct Rubex 203 Yammy hub.

Is that ring between the prop and the leg housing supposed to be there?
My mechanic said it’s installed as per spec, but he’s never seen that ring before.

 

[TheNootkaRose]

Finally heard back from Solas after two weeks. Turns out it's fine.