Class rule states 4000mm from the front of the main beam to the "bearing surface" (ie. forward side of the block sheave) for the spinnaker tack line. There is no "official" pole length limit. The minimum pole diameter is 38 mm (no maximum limit). Min weight for pole, snuffer, stays is 2.5 kg(?).

I just had the exit block (a harken) pull through the ~1mm thick carbon windsurfer mast I currently run as a pole. Re-wrapped the 6 inches at the pole end with Unicarbon, cut an exit opening and placed a 3/8" dia. solid carbon rod vertically through both sides of the pole tip.







I lashed a hiload harken bullet block to the rod. This allows the block some freedom to move left/right as it gets pulled upwards through the opening when the sail is set. I did this because I noted line chaffing with the normal exit block fro mthe off-angle loading of the line. The rod protrudes out the top side of the pole about 1/2". This acts to locate the pole end stays that get looped over the pole end.