Kodak RFS 3570 - Manual (Page 65)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
 Using the KODAK Driver for Adobe Photoshop (Macintosh) G 5-9
C. If the single-frame holder adapter is not in the Scanner, put it in
place in the Scanner. Do so by holding it in the orientation shown
below with the slots (at the left and right of the adapter) facing
forward, and then slide the slots all the way down over the edges
of the front of the metal frame in the Scanner.
KOD AK Professional
RFS 3570 Film Scanner
Single-frame
Holder Adapter
. . . insert if not already
in Scanner.
The slots on both ends . . .
. . . wrap around
the frame in the Scanner.