Kodak Ektalite 2000 Operating Manual page 11

Operation
Place the loaded slide tray on the projector. Align the gate index at the
zero slide position. The tray will drop.
Gate index
Front-Screen Projection
Remove the tray's transparent cover (or the lock ring) by turning it
counterclocla,vise and liftins it off.
Lock ring
A098_00738
Check each slide's orientation (horizontal or vertical) and arrange them
in the order you wish to show them. Then turn the slides upside down.
Number each mount in the upper righrhand corner.