For Sale: Clearout Pt1: Wheels - Hed/Hed3/Quest. Huge Frames - Canyon/Condor. Tyres - Conti etc

Yes, black steel freehub (pre 2007) is convertible.

Rears with threads for a screw on block can be converted to fronts in theory, but it's not worth the hassle since there's no shortage of ready made fronts.

Where does one find this glut of £200 front HED3's?