It may have been a running change made from the oval slot to the square cut out. My Fry 17 has the oval slot in the middle of the access door. My Fry 77 has the square cut out on the left side. In my opinion, the square cut out is more convenient to "park" the gallon selector handle than line it up with the oval slot and close the panel. The selector handle has to be just the right height and horizontal position to go through the slot.