How on earth are you to unzip/zip up the boom bag at the arch end of the boom, from within the cockpit. The zipper has a string attached but that's not much good as the tail of the zipped sides are not restrained. I'm not that short and I struggle while on tippy toe from the helmsman position. Should I drop the boom to the arch by loosening the topping lift and lazy jack lines? Maybe climb up on the arch, any tricks?