Somehow when I made my lamp base with the bezier curve, I didn’t get any faces on the bottom of the hole in the base. I had to (when finished with converting to mesh) add a face to the hole in the base for the stem. Consequently, my stem had no top face to extrude. I selected the edges around the bottom and made a face then I duplicated it, made it into a separate object (using P command) and then extruded it. In the process of doing that I now have only one face on top of the stem. I certainly hope that will not be a problem for the rest of the model. I suppose I can add loops (ctrl r) to get them. Any suggestions?
Here’s my model with the stem