Raise3D N2 and N2 Plus printers arrives with a fully calibrated build plane, and it is really uncommon that they requires a calibration during time. But well, if for any reason it is needed to adjust the calibration (for example, prior to use a non-standard platform), then the operation is quite complex. Under the build plane there are many regulation points, each one with three different screws. A kind of nightmare, without the right tools.
The mounting bracket (modeled to hold a Borletti dial caliper), can be really useful to simplify this operation. Just mount it on the extruder assembly, and regulate each point to have the same distance from the extruder. The bracket is rigid enough to insure a very good precision, and allows to reach a tolerance of 0,01-0,02 mm. on all the build plate. The attached 3DM model allows to modify the size of the bracket to mount different dial calipers.