Paul Silvia's excellent website: adjustingvintagewatches.com/
In this video I discuss static and dynamic poising and positional timing. I also show how to manually calculate the lift angle so your timing machine can accurately estimate the watch amplitude.
This is part 1 of the video, which is pretty discussion-heavy. Stay tuned for part 2, where I see how close I can get the Bunn Special to zero deviation across six positions.
One correction. I refer to the "escapement" angle. George Daniels calls this the "escaping" angle. Potato potato. Please feel free to jump in if I've misrepresented him or any other topic in any way.