I'm not exactly sure what the part is supposed to look like, so I guessed. This may not be what you're looking for, but I used your existing geometry to create 2D top view of that part using the FLATSHOT command, then used PRESSPULL to extrude the hub, and then the "flange", which I believe is the easiest way to make that part.
Here's a video demonstration. --> http://www.screencast.com/t/rkrbuhFOQ
If you still need assistance trimming solids, we can certainly help with that as well, but the model you posted didn't actually contain any solids.