Re: Downsizing mast 1 foot...problems?
At a minimum you will need all new standing rigging, all your sails recut, and frankly I don't know I would trust a mast from another boat anyway. Unless the righting moment on the boats is the same (happen to have a NA nearby to run a couple of thousand of dollars in calculations?) it is very possible that the new mast could be to weak for your boat.
All in all if you don't trust the repair then sleave that section, or cut it off. Masts are not interchangeable.