Yeah, we have the 60 HD too, but how did you transplant 70 spindles on a 60 housing? The housing and spindles are all one piece. And like I just found out, the only difference between the two spindles is the inner diameter, so, with the right tools, you could just open up the hole in the 60. It's not like anything rides on it or anything, so it wouldn't have to be perfect.
I'm trying to find info on opening up the spindles if anybody knows of any. So far Google hasn't found me much of anything.