Furuno SFD-1010 Operator's Manual page 190

5. INSTALLATION
8. Securely tighten wing nuts (four in total). (The use of tools is allowed.)
Note: Do not tighten the wing bolts excessively; flush mounting brackets or wing bolts
may be tilted or distorted. Referring to the figures below, check for any tilt or
distortion.
5-6
Display
unit
Flush mounting bracket is at right
angle.
Wing bolt
Wing nut
Flush mounting bracket
Protector
Flush mounting bracket is tilted
inward from the right angle.
Wall (or panel)