Excellent tip Paul, I like the idea of using a marker on the tooth tips, I would just look for whether the brass was touched or not with the stone by looking for brightness on the tips, but the marker will give a easier way to see that...In my opinion (understand that I am by no means a authoritative on the subject), that the understanding of how a escapement works is key to solving many issues in clocks and watches, lock, drop, impulse, angles, ect...miss adjusted, or worn can cause a timepiece to run slow, fast, irregular or not run at all. A often overlooked and or misunderstanding of the escapement function can cause frustration and unnecessary or unconventional adjustments. Thanks Paul
, William