There's a simple, & time tested way of leading new halyards, plus keeping life in them that goes back at least as far back as when Afro's & Bell Bottoms were in style.
On all of your halyards, you'll want to put a Reeving Splice into the bitter end - APS: Rigging and Splicing Services
- Look about 1/3 of the way down the page.
To make one, you just take out about 1' of core
in the bitter end, & back splice about 6" of the cover into itself, & lock stitch it in place. Leaving you with a nice, solid, slimline, loop in the end of each halyard.
Taking care to make sure that said splice(s) is strong enough to hold a couple hundred pounds of force. Ergo the lock stitching (for solidity & insurance).
Then, when you want to pull a halyard out of the mast. Be it to swap it for a new one, to inspect it, or to take them out of the mast for Winter storage
, & or UV protection etc.
You'll need to pick up a spool of decent quality small diameter cordage, say 1/8"+ dia. And 3/16" is even better.
So, with your new spool of messenger cord. Tie it through the end of the Reeving Splice. And go ahead, & pull the halyard out of the mast. Making sure that the messenger line follows right along with it.
Also, it's important to ensure of course, not to use a piece of messenger line which is less than 120% of the mast's length. And preferably, say 240% of it's length.
The extra length being so that you can secure (solidly) one end of your messenger line to the bow pulpit, or a pad eye in that vicinity. And then, on the other end, it'll leave you with enough length for it to run down the inside of the mast, through the turning block at the mast base, & back, over the cabin
top, through your line clutches, where it gets tied off to a winch
or cleat there.
If you're going to leave more than one of these messengers in position, say, through the winter, make sure to attach (waterproof) labels to them. So that come Spring time commissioning, you know which is which. It's a headache saver.
Also, if you're going to leave these messenger lines in a stepped spar all Winter, make sure they're drum tight. As the wind
will exploit any play in them, & cause them to chafe (which can make for headaches later on, especially if it's enough to make'em break).
Or, once you've pulled out the old halyard, with said messenger attached. Untie it from the old halyard, & tie it to the reeving splice in the new one. And from there, it should be an easy pull to get the new halyard led through the mast.
I say should be, as sometimes halyards cross one another inside of the tube, & create enough friction that hauling a new/another halyard or messenger through the mast requires a bit of force.
Hope that helps, & yeah, at first glance it's not a low $ solution. But given how much extra life you get out of your halyards by removing them for the winter. Or long stints where the boat's out of service
in the Summer, well, buying
that spool of 3/16" cord, plus sewing in those reeving splices, pays for itself fairly well.