I'm going to replace the halyards on my 7.3. This boat has internal halyards. I have never replaced them before. What's the process for getting the new line inside the mast? Do I have to remove masthead casting that holds the sheves(sp?) or, is there some way to use the old halyards to pull the new halyard through. The mast is currently down. Thanks for any help you can be. Incidently, this is my first post here. I've owned my 1984 7.3 for about 9 years but it has been out of the water for the last 5. Getting it back in in about 2 weeks.