Update:

In today's mail was the replacement lucite piece . . . Vantage Plane
Plastics enclosed a copy of their fax to the manufacturer . . . the
entire replacement was done at no charge . . . not even shipping. I
will only have to do some careful drilling to resolve this entire
episode. I could not be any more pleased and satisfied. Vantage Plane
Plastics gets ALL my business from now on for anything I need that they
supply.