Thought I would share this even if it is common knowledge. Many times thru previous work on a clock or by just plain old abuse the brass piece that holds the pivot outside of the main plate for the escape wheel becomes twisted if not just a tiny bit , using a technique I used in building orthotic braces with joints you have to line up 2 holes perfectly parallel to each other or else they will bind. In the case of a escapement set outside the plate the 2 pivot holes need to be exactly parallel in all directions (this is true with ALL pivots) but here we can make the adjustment. Place the plates together and tighten with the screws or nuts just as if it were assembled.
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Using a piece of pivot wire or anything round, straight and long enough as close a diameter as the hole as a guide, pass the rod thought the escape wheel side with the angled brass piece "arm" and trace a imaginary circle around the corresponding hole on the opposite plate.
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Notice whether it is circling the other hole equally all the way around or not. If not then make the adjustment accordingly to the "arm" and test again. once it looks proper put the escape wheel in and check the end-shake (must have some end-shake) if all is lined up then give it a spin and see if it runs freely,
- This movement needed a slight twist to the "arm" in the downward direction to allow for a perfectly free spinning escape wheel.
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if adjusted right you will have a smooth running escapement. This also works well on the exposed escapement and any other areas where there can be an adjustment made to line up holes.