From Bill; 1997 Cat 22 at S. Shores NCI previously posted message concerning possible reasons for keel cable break especially under the swage. I now post this as a seperate topic because the answers I got included those from people who used boat in salt water for more than 20 years with no ill effects on the cable--same cable the entire time. However both of those people appear to have kept the boat on trailer rather than at dock. In my case more than 5 years continuous in brackish water at the slip failed to produce any corrosion under the swage or any where else. So once again I ask what accounts for the cable wear that is supposed to be frequent and is the salt water threat greatly exaggerated by Cataina Direct who advise changing cable every 2 years. Those who responded to my previous thread about "why cable breaks" emphasized importance of frequent inspections of cable. However that misses the point of Catalina Directs advice: they point out that you cannot see under the swage and they say that is most frequent point of corrosion. I sawed my swage open on the old cable to find that there was no corrosion. So I ask again why is there no corrosion in salt or salty water in the experience of at least several of us and is it the loosely flapping unwound cable that produces the stress or the vibrating humming cable produced by taking up the slack a turn or two? I always eliminate hum by loosening turn or two with--as I say--no ill effects.