Humminbird VHF255SW - Manual (Page 25)

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5. Working from the rear of the dash, align the ratcheted mounting circles on each
side of the radio with the central hole in each mounting bracket.
6. Use the two short M5x10 screws to screw the mounting brackets to the sides
of the radio.
7. Slide two M5x32 screws through the screw hole in the mounting bracket, then
attach the lock nut and the stopper. If your dash exceeds 1/2" (13 mm) in
thickness, you have the option of discarding the stopper nut if necessary.
8. Tighten the M5x32 screws until the radio is held against the rear of the dash.
9. Tighten the lock nuts to secure the installation. Do not overtighten.
Nuts (4)
M5x10 Screws (2)
Recessed mounting brackets (2)
M5x32 Screws (4) Caps (4)