Harken ratcheting not working

The ratchet function is not working on my mainsheet block. Is there a way to fix it? Thx Pete

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New Prindle 18-2 Owner
Former Prindle 18 Owner
Multiple Hobie 16s
Boylston Massachusetts
Webster Lake Indian Lake Narragnsett Bay in Rhode Island
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discussed in detail recently at this link - http://thebeachcats.com/f…ms/viewtopic/topic/14539