It does remove (and compress) material, but it could be just a micron or two to several hundredths or more. Burnishers as used on pivots always have a straight grain texture, this is in effect a micro file. When burnishing on a Jacot tool you are removing a small amount of material as well as work hardening it. It does increase the wear resistance of a pivot. When I make a balance staff I generally leave the pivots 0.01-0.02mm oversize and bring them down to final size in the Jacot tool.
Another lesson learned, I broke the click of a Seagull mov.t (no parts available) while letting down power. Bad design, isn't flexible enough to stay away from the ratchet wheel while do so. Better let it unwind by itself if possible, or be extra super cautious. Anyone can suggest a spring that I can adapt? The hole is 3.5mm.
I'm working on an ETA 1164 triple calendar movement and the day disc does not line up well with its window, see picture. The jumper action seems fine and there are three jumpers for the date mechanism which are all identical.
Has anyone incurred such issues before with this movement? Is the only remedy to adjust the profile of the jumper?