illumination assembly problems
It is difficult to get the two screws that attach the condenser lid to drop straight in the counter bored holes so that they align with the clearance holes at the bottom of the lid.
This is partly because hole_from_bottom
in generic_counterbore
makes a square not a rectangle across the counterbored hole
The nut trap in the condenser for the locking dovetail is a rather tight fit.
The hole for the illumination wires at the bottom of the illumination dovetail is tight for a fixed 2-pin plug to drop through easily. They can be pushed through, but it is not easy when the illumination dovetail is on the microscope.