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Without seeing the part I can only speculate. From your description it sounds like the gear has been fastened to the shaft with a swaging die. If you try and pull the gear over the raised portions of the shaft it will probably destroy the gear. You may have a fighting chance if you turn the raised areas down in a lathe first. There is a large size staking set designed for clocks that sells for under $100.00. If you have one that should be the correct piece of equipment to remove the gear. If you don’t have the set put the shaft into a bench block hole that is just slightly larger than the shaft. To protect the pivot you will need a staking tool with a hole to protect the pivot. You may have to make one. Then lightly tap the shaft through the gear. Do not force anything or you may damage either the shaft or the gear.