Actually the correct join for 24 is either FULL over head join, ie. overhead at 2,000' and then fly 180 to let down on the dead side (south) of 24 and OVER the downwind end of the runway, OR (and how I would fly this myself) is to join crosswind BUT over the downwind end of the runway - NOT a wide crosswind, but as you would if you had joined overhead (and keeping a good lookout for anyone doing just this). You COULD even join on a right base, but this tends to be if you are REALLY happy with what you are doing and where everyone else is.