Furuno FSV-84 - Manual (Page 25)

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4. Set the hull unit on the top of the retraction tank, observing the following cautions:
- Clean the hull unit flange to make sure no foreign material has fallen into the retraction
tank.
- Confirm that the waterproofing gasket is properly in place.
Bolt hole
5. As shown in the figure below use bolts, nuts and washers to fasten the hull unit to the
retraction tank.
Flange at hull unit
Flange at tank
Nut
Spring washer
Flat washer
Flat washer
Bolt