My existing ex windsurfer mast is alloy 430 cm long. I want to use bigger sails on lighter wind days so I expect that the luff on the bigger sails will be longer than my mast.This directs me to ask whether windsurfer mast extensions (which I gather are used to deploy different sized sails) could be used in my mini.Not having seen a mast extension in the flesh,I don't know how they work.Can anyone assist?