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?

I have tried to make sure it is absolutely level with a spirit level, but it is still TICK _TOCKING unevenly. I have oiled it, and as it was working perfectly well prior to being moved I can't understand why it wont now. It has a single weight and is wound by pulling on both chains to raise the weight.
One day later - I haven't really done anything at all, but today the clock has gone all day bar one stop at lunch time. Maybe it is just aclimatising?