I'm thinking about buying a hub motor that seems to be relatively common in the alibaba/ebay world but has a pretty strange shaft coming out of it (see pictures). It has a D profile that doesn't go all the way to the end of the shaft, and it seems to be 24.8mm in diameter, not 25 or 25.4.
Is this some common size / shape that I'm not familiar with? Is there some specific part that it is supposed to mate with?
Barring that, how would you design a simple, cheap mount for this motor? I have some ideas, but I'm interested in seeing what others come up with.
I've also asked the supplier these questions but I don't have a lot of faith that I'll receive any feedback.