Seakeeper 3 Installation Manual (90378-7); S/N 3-232-4223 to Current
2.3.2 Transfer of Holes to Boat Structure
- Lower assembled fixture onto hull structure.
- The four areas where the feet of the Seakeeper will rest should be coplanar to within .06 in. (1.5 mm). See Figure 8.
- Align fixture (P/N 90362) in desired location and transfer holes from fixture plate to the hull structure.
Note: Holes in fixture plate are ø0.64 in. (16.26 mm).



2.3.2.1 Blind Hole Installation
- Remove Template Fixture and drill four (4) 0.65 in. (16.5 mm) holes perpendicular to the vessel structure to a minimum depth of 0.94 in. (24 mm). Take special care to drill perpendicular to mounting surface. A drill guide is recommended. Remove any impeding obstructions.
- Tap drilled holes for helical thread inserts per documentation accompanying helical threaded inserts. (Tap will be included in thread insert kit.)
- Install four (4) M16-2.0 X 24 mm threaded inserts into holes in hull structure at drilled and tapped locations using threaded insert manufacturer provided installation tool.
- Remove threaded insert prong / tang after threaded inserts are installed.
2.3.2.2 Through-Hole Installation
- Remove Template Fixture and drill four (4) 0.67 in. (17 mm) ø holes perpendicular to the vessel structure.
NOTE: Take special care to drill perpendicular to mounting surface. A drill guide is recommended.