The rule is a bit ambiguious about wall thickness and could be read that a constant profile means both inside and outside of the wall. How can you possibly taper an aluminium mast on the inside? <br> <br>In reply to sail 6000's q about weight, how much do you guys have to pay for an inter 20 or a hobie fox, cost will refect the weight the boat can be built to. <br><br>