Use 5 screws of m2.5 or m2.6 16mm.
Added
I also added an adapter for Sony E mount.
I haven't tried this, so please let me know if there is a problem with the position of the lock pin.
Click here for the adapter.
https://www.printables.com/model/226847-microscope-objective-adapter-small-edition
Click here for a guide for macro rails
https://www.printables.com/model/226816-neewer-macro-rail-guide
I made a Fuji version of the microscope objective lens adapter made by SimenZhor.
https://www.printables.com/model/218900-canon-efef-s-lens-mount-with-screw-holes
https://www.printables.com/model/218910-microscope-objective-adapter
Model based on https://grabcad.com/library/fuji-x-mount-to-m39-l39-ltm-adapter-1
ere is the remix source for the Sony E mount.
https://www.printables.com/model/143762-sony-efe-lens-mount/files
The author remixed this model.