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Hi! My name is XXXXX XXXXX it is my pleasure to assist you. No the weight of the leaf keeps the wire steady to its swing. First make sure the clock is flat against the wall and level both ways front to back and side to side. The leaf controls the speed of the clock the higher the leaf the faster it swings the lower the leaf the slower it swings. Sliding the leaf up or down controls the speed for which the clock will keep accurate time. The only other problems would be a worn pendulum spring or the clock needs a good cleaning and re oiling job. As a clock ages the oils and lubricants become gummy and the pendulum starts slowing down and then finally come to a stop or it may become dry and the same problem may happen. It may need cleaning and oiling as they should about every 3 to 5 years or sooner depending on where the clock is hung such as near a ceiling vent or floor vent this causes temperature changes and in line with accumulating dust. Check these options out and let me know. Thanks Mike
What that sounds like is when the weight from the leaf is added to the wire it stops swinging so therefore it has to be a worn suspension spring. The tension from the spring has streached and needs to be replaced. Thanks Mike