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Editing Step 11 —

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This fin provides thrust stability during dives.

Remove any plastic backing from the polypro fin.

Attach the fin to the back of the ROV into the two notches on the polypro shell. You may need to remove plastic from the holes in the shell to ensure a proper fit.

Secure the fin with the 8MM plastic screws and nuts as shown. Pliers may be needed to hold the nut in place. Once in place your thumb can hold it steady while it is screwed from the other side.

Adjustment may be needed on each side to ensure a secure even fit for the entire structure.