Assembly  All the steps described for the assembly of the microscope must be undertaken with extreme care,  and without forcing the placement of the distinct parts and elements of the microscope. A. Condenser (10): Turn the coarse  focus knob (19) until the stage (8)  reaches its highest position. Turn  the focussing knob on the condenser (Fig.1) until the condenser holder reaches its lowest position. Unscrew the knurled locking screw on the condenser, and insert the condenser in the mounting ring so  that the aperture of the diaphragm  (9) faces the front of the microscope and so can be adjusted easily. Once firmly placed in the mounting ring, firmly  tighten the locking screw, and turn  the condenser focusing knob until  in its highest position.  Condenser set screw Condenser  focusing  knob  Fig. 1  -4- 