Used my new Rotisserie for the first time Sunday April 3.  Purchased it on 4/19/2020.  It went together nicely and worked great on the grill.  When i took the roast off the grill and Tried to loosen the thumb screw on the fork it would not unscrew.  I had to use a pair of pliers to loosen it to get my meat off the spit.  Not sure what happen but it should not have.  Please advise....