Kankama said..
24ft yacht has a small mast. I would drop it myself and pull the cables through. A rigger would probably want it down anyway.
To get a small yacht mast down, find a friend with a bigger boat. Raft up, masts abeam. connect your kite halyard to theirs on a calm morning and winch it a little up and down.
Then you can work on the mast to your hearts content. Insert a conduit to run the vhf aerial through and check the sheaves.
cheers
Phil
I agree. I pulled the mast down on a 26 footer by myself using this method in the photo.