2.4.2 Transfer of Holes to Boat Structure

1. Lower assembled fixture onto hull structure.
2. The four areas where the isolation mounts will rest should be coplanar to within 1/8 in. (3 mm). See figure below. Do not use the fixture to check co-planarity as it is not stiff enough.
3. Align fixture in desired location and transfer holes from fixture plate to the hull structure. A transfer punch is recommended for this step. Note that holes in fixture plate are ø.257 in. (6.5 mm).
4. Remove fixture and drill holes in foundation at marked locations to mate with holes in Seakeeper isolation mounts. A ø.689 in. (17.5 mm) hole is recommended for through-bolt installations.

NOTE: Certain foundation designs that employ threaded blind holes in thick plates may require the installer to obtain alternate fasteners. Reference Drawing No. 90614 – Seakeeper 26 Bolt-In Installation Kit, M16, Blind-Hole.