Why "overkill"?  Because overkill is underrated.  These are the strongest dock anchor cable dampeners I make.  I had a guy who has a monster dock on Lake of the Ozarks send me a picture of his failed dock cable dampener (see below).  It had a broken compression link that looked to be made from 1/2" round bar and a junkyard coil spring.  The spring still had the rubber isolation dampener from the automotive application, used to cut down on road noise.

 

This did a couple of things for me.  It opened my eyes to a need for a more substantial dock cable dampener, showed me that inferior parts used are going to fail, and that there are monster docks out there that are more than twice the mass of what I have here on my home lake. 

 

The Overkill Dock Springs weigh more than 58 pounds each... more than 20 pounds heavier each than the Heavy Duty Dock Springs I make.  I use one inch diameter steel round bar for the compression links instead of the 3/4" in the other springs.  One inch is substantially bigger.  See the picture above comparing 3/4" and 1".  One inch bar takes 4 times longer to heat to forging temperatures where it can be formed into the compression link.  One inch bar, once at forging temps, takes twice the effort to move.  Its hard work.  One inch bar is more expensive than 3/4" round bar.  This is why they are priced at $750 a pair.  

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If you have a large multi-slip, two story, concrete paver covered, monster party dock, these are for you.  If you have had dock anchor cable dampeners fail and don't want to have to fix your dock again, these are for you.  If you just want to make sure you have the best cable dampeners available to secure your investment, these are for you.