Weak Grip Causing Too Extended At The Top

A weak grip can cause an extended position at the top of the swing because the extended wrist position helps the left hand support the weight of the club at the top of the swing. The weak grip can also cause an overly flexed wrist causing an inside takeaway. That inside takeaway often leads to an overly verticle end of backswing that is often accompanied by a wrist that is overly extended and radial deviated.