You can’t tighten your halyards enough to keep them from clanking. But here are a few easy solutions that do work.
Bungee cords – https://amzn.to/2W7c3hA (Amazon)
Shroud cleat – https://fave.co/2JewfZB (Affiliate)
Prefer to read? Check out How to Quiet Clanking Halyards.
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i live on freshwater and im the only sailboat in my marina so keeping my halyards quiet not only makes me sleep better it makes me popular 😉 i use camlock style tiedown straps that i cut down to length. one hook goes to a shroud and because my halyards are external the other hook capture both ends of each halyard. the ones i started with were super cheap diecast zinc. that will not fly on saltwater. I have since upgraded to 316 stainless ones. and replaced the hooks with loop ends and softshackles. Amazon sells just the 316 camlocks and i just re used the webbing i already had. I made the softshackles out of some 2.2mm dyneema i had an abundance of but there’s no good reason in this application you have to use dyneema. or even use a fancy button knot. a wooden toggle on a loop of whatever small stuff you had lying around would work just as well and because you can slack the webbing it makes getting the toggle out easy.
the camlocks — https://amzn.to/2NvSxIX