Developed a mechanic with fixed stem positions, for use in "cockpit" buildings, for example as a crane chassis, release-cleaning shields and other.
A non-contact sensor can be installed on the mechanics (for example, MagRes) if the program (controller) allows you to split the axis range into different functions. In this case, it is possible to have more than three fixed positions.
Or three microswitches in each of three positions (the bar with three microswitches will lay out a little later).
I worked two types of rods with the fixation, I want to know your opinion about which implementation is preferable for you, namely, the spring on the side of the bolts or the spring in front of the rod on the protrusions of the rods.