Bob wrote:

(3) The towline used has breaking strength not less than
80 percent of the maximum certificated operating weight
of the glider
....
However, the towline used may have a breaking strength
more than twice the maximum certificated operating weight
of the glider
....
with a breaking strength not less than 80 percent of the
maximum certificated operating weight of the glider
....

and not greater than twice the maximum certificated
operating weight of the glider;
....

Four mentions of "certificated" in a single section, but the FAA doesn't
care what you tow. Gotta love these creative interpretations 8^)

Marc