I recently acquired a mini grandfather clock with a “Synchron” electric movement. It works fine, but it loses about 10 minutes in a 24 hour period. I’m wondering if there’s a way to adjust the speed of this movement. It has a pendulum that is not adjustable. I’m guessing it’s more for aesthetics than having anything to do with the “beat” of the clock. It hangs from a swinging arm attached to the movement. Thanks in advance for any input!