Nikon SF-100 Slide Feeder Adapter LS-1000 - Manual (Page 14)

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Step 3
Set the slides with their apertures vertically oriented with
respect to the LS-1000, and with the emulsion surface facing
the slide push plate.
✔
Remarks
Do not set the auto slide feeder horizontally, as this will prevent
scanning of both ends of the film, and may also cause the slides
to jam inside the auto slide feeder.
Step 4
Disengage the slide push plate from the notch and release it
gently so that it is pressing against the slides.
Close the cover.