Rewording for Rule 4

4. Mast construction and rigging shall be un-restricted.
A contrasting measurement band shall be located on the mast no higher than 6metres above the top of the front beam. At no time shall any part of the main sail with the exception of a halyard lock, shackle or pocket luff sail cap be located above this measurement band.

Some sketches of each of these conditions may be appropriate.

Thinking about it some more, for junior boats I really like the idea of being able to drop the sails with the boat and mast upright for safety reasons. Should shackled or pocket luff sails be allowed with this consideration. Having sailed a pocket luffed moth and knowing how difficult it is to be rescued with the mast still up, I am very tempted to have a clause to cover this.