You have isolated the problem. A few places to look at this point are the pallet jewels for angle and length. The jewel on the long side of the pallet (right side) should have a more severe angle than the jewel on the short side of the pallet (right side). You must step through the movements one index at a time and observe the process. Check for the proper amount of drop and lock and make sure the angles on the pallet jewels are correct. If they are reversed, it will not work. Also, make sure the escape wheel has not been damaged. Each tooth of the wheel should be exactly like every other tooth in size and space between the teeth. if the banking pins are too restricting, they will not allow the pallet to perform properly.