Quote:
Originally Posted by jmen24
It puts a tension member in the frame. If you pull up your dock without this line attached and site the A frame you will notice about 4-5inches of sag in the A frame. Then install the tension line and see that that sag reversed into a slight bow after tensioning it. Its sole purpose is to remove the sag, which could in fact cause the frame to buckle.
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It's obvious from the photo that jmen24 is correct.