i am soon adding a 500mm section to the mast. considering fitting at mast base, it will neccesitate lengthening the existing dyform rigging x6 stays , which i dont want to replace yet . my question is , what is the best method of extending the existing rigging ? i like the idea of using ,pbo or the likes of , from the bottlescrew down to the deck chain plates using a block . but how do you tension this kit ?