Roy asked if a gear puller was used to separate the gears fro m the arbors. My answer grew to warrant it’s own post.
The gears are are attached to the arbors in a number of different ways, depending on the gear and the role that each plays.
The gear which corresponds to the minutes of the clock, uses a tri-legged pressure plate (one leg of which is seen touching the 2nd gear back) so it is linked only by friction. This allows it to slip (with difficulty) so the time can be adjusted without disengaging the gear train. It also means if the hands of the large tower faces were to freeze up, the clock would not jam.
The main drive gear (with the weight drum) uses a large cotter pin and a collar. I’m not convinced this is original. I will be investigating to see what was used in the late 19th century.
The birdcage gear and the escapement air-brake used small steel pins. I’m pretty sure these are original as I’ve seen them used in smaller clocks from the same period.
The difficult part is there are two gears that were “pressed” onto the arbors and another two that were sweated and lead soldered in place. I have not yet decided if I can get the soldered gears off. If I do go this route, it will only after considered the stresses these gears are under, because I would prefer to pin them back to the arbor rather than solder them back.