Brack,
We have been making our own version of the XR hub for years now it is a solid weld in.This was before Merc started letting everybody make the square bore props to fit their hubs.If your props have large hole on gearcase side and small hole on prop nut side,it is usually real easy to convert,providing the overall length of the prop is same.We would charge 165.00 for the whole deal.FYI Performance Prop buys all their XR hubs from us as well as Mazco.This is for removal of old hub,and installation of new XR hub.Hope this helps.Now go tell them SOONERS TO KICK MIZZOUS BUTT.
Todd