The B&W Companion Gooseneck-to-5th-Wheel Trailer Hitch Adapter - Dual Jaw - 20,000 lbs # BWRVK3500 has a binding issue with your king pin. The cam action latching handle sounds like it isn't functioning correctly. If the head has been damaged, I recommend replacing it. If it isn't damaged and yet isn't functioning correctly, I recommend contacting the manufacturer about coverage under the limited lifetime warranty.
If you need to replace the head unit, the Replacement Head Assembly... view full answer...
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