NARDA SignalShark 3330 Consignes D'utilisation Et De Sécurité page 62

For opening the housing, an Allen Wrench(6 mm) is included in the kit for
the Modem R version. The Allen Wrench can be purchased separately from
Narda (item no. 3330/90.22).
 Using the Allen Wrench, loosen the screws in the corners until the
housing can be opened.
Closing the Outdoor Unit
1. When you close the housing, make sure that the silicone seal is correctly
seated in the designated groove to prevent the ingress of moisture.
2. Tighten the screws using the Allen Wrench.
62 SignalShark 3330 Outdoor Unit
Narda