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Typical Installation

One of the first things that you have to do is to find the best location, bearing in mind head room clearance and with no obstructions such as wiring or fixtures. First measure carefully inside and out to establish the correct location on deck. A six inch hole saw will work for the taking it through the fiberglass skin and the balsa core but not through the inner fiberglass skin on the other side of the balsa, this will be used as a base for the prism. (See Photo 1)

If not using a hole saw, use the prism as a template for marking the area where the hole is to be made, plus 1/4 inch all around to leave room for sealant. The ring is used to mark the location of the screw holes.

Once the hole is done you will need a 4 3/4 inch hole saw to cut the inside portion of the deck. If the inside of the deck is also your headliner then you may want to cut from the inside to get a smoother finished cut on the inside. (photo 2&3)

If you have a space between deck and headliner you can cut the 4 3/4 inch hole from the outside to keep the mess from going inside the cabin. (especially the fiberglass sawdust of the inner skin.(photo 3)

Photo 1

Photo 2

Photo 3