I'm back with another question (peddling as fast I can to come up to speed). I have the attached model where I have two problems with it. One is that because (I presume) of the way I constructed it, it's all Surface (less two small pieces which are cylinders). I'm having a difficult time closing it up. I can see the edges with the script but am confounded as to what to do next.

As part of that, I need to close up the hole at the bottom of the part so I can attach a cylinder of the proper diameter (the one I had was the wrong size and I used a boolean operation I should not have an cut a hole).

To create the part to begin with I drew a profile with polyline and then extruded it. Was there a better way I should created it to begin with to avoid this mess?

Can someone point me in the right direction?

Thanks