I screwed it back in, hand tight, then used both hands to adjust. I also noticed that I wasn't seeing behind me very well. So, I put it on the side stand and turned the wheel all the way to the left and adjusted the mirror (using the bottom adjustment) so that it almost touched the windshield, and then adjusted the mirror using both hands. I'm going to have to do the same with the left mirror. I have seen complaints that the mirrors don't give much of a view. I can see almost everything behind me now :-)
Are there pictures/docs on how to screw extenders into the stalks? I'm thinking that might be one way to change mirrors.