Lexmark 302 - Manual (Page 41)

3. Lower the forms device into the printer behind the platen rod so
that the bottom metal bar enters the printer first. Align the ends
of the forms device with the slots in the frame. Continue to lower
the forms device until the device rests in the slots of the frame.
E n d o f
D e v i c e
E n d o f
D e v i c e
S l o t i n
F r a m e
S l o t i n
F r a m e
T o p o f
F o r m s
D e v i c e