| 摘要 |
A frangible sailboard fin retainer and method of releasably retaining a fin to a sailboard fin box including forming complementary openings in the fin and the fin box, inserting a bolt assembly having a bolt and a threaded female threaded member joining the fin and fin box. A portion preferably a position of the threaded member is brittle and breakable upon impact of the fin as a result of an aftward blow on the fin.
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