Hi everyone: A client has brought an early Andreas Huber 400 day clock, with a flat disc type pendulum, for repair. The suspension spring is incorrect. Does anyone have the correct strength for one of these. Approximately what are the dimensions? Whatever info I get can be used to get me started with the timing. I have the original top block, fork and bottom block. The suspension spring has been changed and I suspect that it is wrong, as the clock runs very slow.