there probably is no need to replace the rope. Only exception being if it is frayed where it engages the cleat, thus causing it not to hold securely.
if that is the case you can also cut the rope down and then tie a larger diameter piece of cord onto the end so that the beefier cord is what engages the cleat. This works well.
If the skeg is lacking "oompf" in deploying then you will want to shorten the bungees that come through the deck in order to increase their tension, or you can replace the bungee. The bungee is what causes the skeg to work...or not work in the event it is over stretched or worn out.
Reflective Hull Decals
URCHIN Portable Anchor
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