Garmin GMR 430 XHD3 Series Installation Instructions Manual page 6

3 From under the mounting surface, place the shoulder washers
the mounting surface so they fit securely.
4 Place the flat washers
5 Torque the hex nuts to 1.5 kgf-m (130 lbf-in. [11 lbf-ft.]) to securely fasten the radar to the surface without
damaging the radar or the mounting hardware.
6
, lock washers , and hex nuts
on the threaded rods and feed them into
on the threaded rods.