Antique Victorian Black Slate Mantle Clock?

does anyone know how to adjust the pendulum to stop the clock losing time, also the chime works intermittantley, it works on the half hour but sometimes not on the hour, but if you put the key in and turn it a bit to the right the chime works!
Any suggestions to clean black slate and make it shine?

No answer on the clock movement

Answer for bringing back slate to make it shine

take a soft lint free cloth and squeeze a small amount of baby oil on it and wipe the surface of the slate. Buff when completed. This treatment works beautifully on my natural slate fire surround and fireplace.

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