Doug,
my replies from last night don’t appear to have posted there are various articles in past bulletins which can be found within the reference section of main menu, I raised/lowered A90s mast on a number of occasions the trick is ensuring that the shrouds remain tight either by raising the attachment point to the same height as mast pivot this can be done permanently see https://drive.google.com/file/d/0B7zprD7rUaoBNFZsRFd1eUxDMTg/view?usp=sharing
or temporarly using this https://atalantaowners.org/wp-content/uploads/2017/04/AOA-Bulletin-1986-87.pdf
i stopped raising mast myself when I smashed wooden mast after a shackle parted i decided its far easier to have it craned on and off at end of each season
Dom