Many thanks to all for the great suggestions as to how to stabilize a plinth and still be able to remove the installation.
Also, Tony Moss' discussion about that dead spot in the dial when the gnomon doesn't have a knife edge or zero thickness was timely. When I was figuring the dial plate's latitude, I _thought_ some of the angles near noon were sort of funny as figured from the intersection of the 6 to 6 line and the centerline of the gnomon. Now it's embarrassingly obvious what the cause of that was! Many thanks, John Bercovitz -
