Resheaving Main Halyard
I depending on the boat, on a 26 footer is probably easier to lower the mast to the ground and remove the mast base plate and then use a pvc pipe to feed the line. You can 1/2" and 3/4" diam. PVC piping for next to nothing and it is very easy push a messenger line ip the mast. I like using PVC since it is easy to screw the connections togther and be able to store the pusher for future use. Before you feed the tube in make sure you the other internal halyards are pulled tight and in thier normal positions. Position the mast with the right part of the mast facing down so that the tube passes through the mast exactly where you want it with a clean lead past spreaders and other obstructions.
There are a number or ways to pull the halyard through but the easiest is to put a looped pig tail of 1/8" line on the end of the pipe so that you can hook that with a hanger and pull it out of the mast. Stitch the end of the halyard on the pigtail and pill it down through the mast. Stop when you get to the exit box and fish the pigtail out. The other way is to tape a messenger line to the pipe and pull it to the top of teh mast and then fish it out.