Those are actually not made by "test rite" its just a marketing make, Dozens brand names have been put on that basic DP over the decades, and probably still are. If not from the same factory, they all use the same castings and essential specs.
You should be able to find a donor table and the table crank. Used machinery shop or even CL for instance. I believe the column is the std 2-3/4", so verify and you can put a table from any make or model, as long as the column is the same Dia.