Raytheon HSB L755, Owner'S Handbook Manual

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2-16 HSB Series L755 and L760 Fishfinder
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Installation
1. On a fiberglass hull, to minimize surface cracking of the gel coat: Before
drilling the pilot holes, use a 1/4" (6 mm) drill bit to drill a shallow hole
(chamfer) at each location about 1/16" (1.5 mm) deep.
Drill pilot holes 3/4" (19 mm) deep using a 9/64" (3.6 mm) drill bit.
To prevent drilling too deeply, wrap masking tape around the drill bit about
7/8" (22 mm) from the tip. Drill in only as far as the tape.
2. Apply a good quality marine sealant to the pilot holes to protect the hull
from water penetration.
3. Attach the bracket to the hull using the panhead screws with flat washers.
Do not completely tighten the screws yet.
4. Move the bracket up or down so the leading edge of the transducer has the
clearance shown in Figure 2-5.
5. Once the bracket is in the correct position tighten the screws.