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You need to let the pendulum bob down. It should have a nut under neath the bob. Remember clocks that have pendulum movements. To make it gain higher the pendulum, to make it lose time lower the pendulum.

I would like to see a few photos of the movement, dial and case if possible. 

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Hi John  As Old Hippy says either move the rating nut up to make it go faster or down to slow it down, But first of all make sure its in beat (even tick and tock) then set the rating if all is ok.  I take it when you serviced it you checked all the pivots and pivot holes for wear and re-bushed any worn ones.  Again some photos of the movement would be appreciated.

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