Its 15 years old right? Call a clock repair man to check for wears and overhaul it and oil it. After that when he is done oiling and overhauling it swing the pendulum, it will tick. when its not even tick tock like tick-tock----tick-tock then put something under the feet like a penny to balance it. do it several times until the tick tock is even.
David
June 2010