Andy I think you are thinking about 6.8.3 and Hank is talking about
6.8.4.

6.8.3 â€* No-ballast rules
No-ballast rules shall apply on a day when the CD has announced this
prior to the first launch.
6.8.3.1 Disposable ballast is prohibited with the exception of
disposable tail ballast.
6.8.3.2 Fixed ballast is permitted, but not more than an amount that
brings the sailplane to its maximum handicap weight, as
defined in the SSA Sailplane Handicap List.

6.8.4 ‡ Limited-ballast rules
The CD may announce a limited ballast day no later than one hour
before grid time:
6.8.4.1 ‡ A maximum takeoff weight shall be announced.
6.8.4.2 ‡ Sailplanes may carry disposable ballast that yields a
takeoff weight not greater than the announced maximum.
6.8.4.3 ‡ Sailplanes may exceed the maximum takeoff weight only if
they follow Rule 6.8.3 and if they do not carry removable fixed
ballast (bags of shot, sheets of lead, or any other baggage whose only
purpose is to increase weight).