Due to lots of folks asking we've decided to sell the Dexter 81-9A hub along with the BT8 Spindle and bearings. Also included is the rear seal but we advise you don't use that for your wind turbine project, the friction is too much. This assembly is the one we use for the 7 and 10 foot diameter wind turbines featured in our book, and it should work with Hugh Piggott's smaller machines 8 foot diameter and under.