The threads on the 17 and 18 dolphin strikers are fine threads, so I suspect the 16 is the same. Just something to consider when chasing the damaged threads and replacing the nut. Using a coarse die or nut will cause more damage.
It also may be possible to offset the rod slightly to one side so that the nut on the "bad" side ends up on good threads. You may also want to use double nuts on the bad side to provide extra strength against the treads pulling out.
Finally, keep in mind that the dolpin striker is probably the most critical structral member of the whole boat. If it fails, your front crossbar is likely to collapse. So if you think the strength may be compromised, don't use it.
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