Bob,
have you ever considered a video on the use of a jacot tool? the reason I ask this is that I am currently working on a French drum movement and the pivots on the escape wheel are quite bad to the point they will both need replacing. They are very fine and as I dont have the gear to do it on my lathe I thought about using the jacot tool that has been sat in its box since I bought it last year. I dont have the first idea where to start