Furuno CH-250 Installation Manual page 27

7. If the gap at a side is more than 0.5 mm, install a shim to make the gap within 0.5 mm.
a) Unscrew four M10x50 bolts.
b) Unscrew four countersunk screws, then attach the shim with the countersunk screws as
shown below.
Nut
Flat washer
Hex. bolt
(M10x70)
Flat washer
Spring washer
Hex. bolt
(M10X50)
Installing shims
17
Countersunk screw
(M4x16)
Guide plate
Shim (1.0)
Shim (1.5)