That's a Mercury prop.

You need to take it to a propshop and tell them the hub slipped and it needs
to be "rehubbed" - a common procedure.

-W

"LD" wrote in message
news
I have a 200hp Merc with a SS prop, slightly cupped, brushed finish, with
the number string 48 73982 A4 21. I'm sure it's a 21 pitch but
apparently the rubber hub has slipped. While running @5600 yesterday, it
"slipped". Afterwards, couldn't go above a fast idle without it slipping
again.
Questions: 1. What make prop is this?
2. Is is fixable and how?
Thanks in advance
LD