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4 / Pro SerieS GS-400 / 450 MountS
1. If you have a foam or core-filled hardtop, make sure its thickness does not exceed 3”.
2. The starting, or at-rest position of the outrigger is facing aft. The handles of the GS-400/450
are set in the same position at the factory. If you require a different handle starting position,
instructions on how to change them are in steps 13-17.
3. Select the mounting location of the Grand Slam mount, keeping in mind that the center of
the 3-1/8” hole on the GS-400/450 must be a minimum of 9-1/2" away from any object in the
direction the handle will rotate from the starting position you choose.
4. After determining the proper location for the 3-1/8” hole, mark the center of the hole and
either drill up from underneath the hardtop with a 3-1/8” hole saw, or drill a small hole
through the hardtop and then drill down with the 3-1/8” hole saw.
5. Insert the Grand Slam unit into the hole with the outrigger arm laying down in the horizontal
position facing aft. You want to make sure that the base is straight before drilling the four (4)
mounting holes. It is easier to tell if the base is straight if you place an outrigger in the tube
and have someone observe it from the stern.
6. Mark the hardtop through each of the four (4) mounting holes on both units, then remove
the units to drill the mounting holes.
7. For a solid fiberglass hardtop, drill each hole with a 5/16” drill bit.
8. Put a bead of marine-grade sealant on the underside of the footprint of the Grand Slam units
around the lower body and around each mounting hole and insert the Grand Slam Mount into
the 3-1/8” holes.
9. Install the four (4) mounting bolts through the Grand Slams, through the hardtop and
through the backing plate on the underside of the hardtop, install the washers and nuts and
tighten the nuts while someone holds the bolts with an Allen wrench.
10. For a soft-core or hollow-core hardtop, drill each hole with a 7/16” drill bit. Measure the
thickness of the hardtop and cut the vinyl spacers to the same length.
11. Put marine-grade sealant on the underside of the footprint of the Grand Slam units around
the lower body and each of the mounting holes and insert the Grand Slam Mount into the
3-1/8” hole.
inStALLAtion
In general, if the hardtop is strong enough to walk on, it is usually
strong enough to mount an outrigger on it.
HArDtoP
