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I am on my 2nd board, from Costco; my bag fell apart after 2 uses... took it back, ordered another one, came in 2 days... works great so far, the paddle is a bit heavy, however, the fin will not stay in, glad I found it on the bottom of the lake, and I am not sure what to do. I have emailed the company with no reply. any suggestions as to how to put the fin in & keep it in?