On the Les Glenans 5.70's which are used for keelboat sail training by Les Glenans in France and Glenua Sailing Centre in Ireland, the mainsails are fitted with three sets of cringles, but there are only two in-boom reefing lines, plus outhaul. What we do, if we are going out in moderate to fresh winds, where the windspeed is likely to increase, is; before leaving the mooring, to remove the outhaul from the clew and rig it as the first reef, and then re-reeve the 1st and 2nd reefing lines through the 2nd and third leech cringles. This way, we are setting off with one reef in, which suits the conditions and can rig the 2nd or 3rd, as required, without any gymnastics or complicated rigging arrangements. It's easy enough, with the accurate weather forecasting we have these days, to get it right, most of the time.