...the carriage brake, with bronze shoe and spring clip.
(to be fine-tuned with a fish scale, at ~2 lbs load before the sticking slips to pull...).
The brake is not necessary for using the lathe, but it keeps the trolley from rolling around fast across the ways whenever the feednut is lifted off the feedscrew. Might save a jewel, some day.
The brake is bolted to the rear of the trolley, and the bronze shoe skids along the rear way... (New brake on left...)
Andrew