Again - thanks to all. I have the owners manual and it did reference the allen wrench, although with no instructions as to how to use it. I l found the wrench and did indeed locate a very small set screw in the pillar. It did not seem loose, but I tightened it a bit and - surprise! - at least for now, the lever is now about an 1/8 inch above the plinth!
Appreciate the help.