I had not considered that. I'll have to think about it for a while. Given the final rough shape of the part and the tools I have available I am not sure I have the ability to do that, but it is worth considering. As a side note, I have already made this part once as a strictly slip fit with a set screw and it works fair. I was hoping the shrink fit would give me better results. The assembly is a spinning part and I am trying to remake it with minimal runout. The part where it attaches to the drive would be very difficult to machine afterwards both parallel and concentric to the bore. A press fit is not practical as the only place to press is a pre-machined precision interface for yet another part.