Sound Devices SL-2-SDV User Manual page 7

STEP 5 Make sure that the SL-2 Expansion Connector
mates with the 833/888 Expansion Port. Then gently press
down on the SL-2 to fully seat the pins of the connector.
STEP 6 Using the supplied 2 mm Allen Wrench,
secure the SL-2 to the 833/888 top panel with the two
captive screws as shown in the image below.
SL-2 User Guide
5