Seakeeper 9 Installation Manual (90222-10); S/N 9-212-3388 to 9-234-4899
2.4.4 Through-Hole Installation
- Remove Template Fixture and drill sixteen(16) 0.59 IN. (15 mm) ΓΈ perpendicular to the vessel structure. Take special care to drill perpendicular to mounting surface. A drill guide is recommended.