Automatic Disengage the leadsrcew half nut of my lathe

[Bullet500]

To stop the carriage of my lathe I also made a system to Automatic Disengage the leadsrcew half nut at any position.
Basic rough adjustment is made by the sliding piece at the right end of the rod and the fine adjustment by turning the rod (M6 thread) so accuracy is +/- 0,1 mm.
I hope the picture and movie explains its function.
In combination with my other modification it is also possible to disengage the half nut and stop the motor at the same time as you can see in the video.