I am trying to get an old pocket watch running for a neighbour of mine. It has Louis Eschholz Gotha inscribed in the case, which would make it easily 100 years old. As you can see, there is a key for winding and setting. Here's the partially disassembled movement, still in the case until I worked out how to remove it. It's got a cylinder escapement, so there was an exciting moment when I removed the balance. What would have been the correct let the mainspring down? Luckily no dam