I have a 20' rooftop mast with four sets of two guy lines. One guy is at 10', one is at 18'. The guys are dacron rope. When the wind blows, I'm hearing this dull noise that's beginning to get on my nerves. I've researched this with little result, I'm seeing things that refer to "aeolian vibration". It sounds very similar to this. I've seen little spiral things that can be put on guy lines, and even little spacers/damper things. I'd prefer to not buy anything if I could make it myself though. Advice, please?