Dolphin, at the back of the clip is a button. If you push the button from the inside back it will give the clip more grip. I use the same kind and for the most part they work good. After awhile they seem to get loose. I have about 8 release clips in the boat so I don't have to mess around trying to fix a slippery clip.
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"90% of Life is just showing up and doing the work". Tred Barta Sr.