If the broach starts to bind in the hole a little oil will help. For your first attempt you have done well. I’m not too sure of the bush you have chosen the hole has very little depth to the pivot and plate. This is why I always made my own. Here are two sorts of bushes that I recommend. Bergeon and KWM I wouldn’t use them. Bergeon clock brooches cutting and smoothing are one of the best, I don’t think they cover the sizes you would need for Longcase (grandfather) clocks I might be wrong. There is another type of bushing when you have experience, that is called invisible, that is when you can’t see that the clock has been bushed.