How do we join a mast using an internal sleeve. We need to join our keel-stepped mast just below deck level. I know that a mast can be joined using an internal sleeve, but cannot find any information on just how this is done. What is normally used as a sleeve, how long the sleeve should be in relation to the diameter of the mast, the number of fixings to be used, etc. Technical information or advice would be greatly appreciated. Many Thanks, Ray.