I have run across a few comments about how drilling the extra holes for the additional block in conversion to midboom sheeting raises the danger of weakening the boom structure. I wonder if anyone has tried to do this conversion without adding the extra block on the boom. How about replacing the existing midboom block with the becket block from the end of the boom and adding the single block on the centerboard cap (which you would do anyway for the conversion) so that the mainsheet would begin at the becket on the boom, run down to the single block and back up to the block on the boom and then down to the swivel block on the centerboard cap. Would there be enough purchase to control the boom? And by not drilling those extra holes would it eliminate the possibility of weakening the boom?