Dave Sr. from SWISCO responded:
January 6, 2015
Hmm, I've never hard this problem before. It should be easy to narrow down the problem, though. First off, try to lift the J hook up and down without inserting it into the keeper beforehand. See if that has any hang ups. If it works okay, next try adjusting or reinstalling the keeper to make sure it lines up with the J hook. Perhaps that's all that's necessary.
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