So I just picked up a cheap Spin Trispoke for one of my bikes, and it looks like it's missing a piece of the hub.
On the drive-side, the aluminum doesn't stick out nearly as far and there's a threaded area, as shown:
I'd assume that this is so that the wheel can be used for the front or rear, and that there's another piece required to use it as a front wheel (or rear, but that's not what I want.) Is this correct? And if so, does anyone have close-up photos of a piece that fits into there? I'm wondering how much work is involved in making this wheel complete.