Humminbird 1158c Combo Installation And Operation Manual page 46

3. Put the pivot bolt through the assembly to hold it in position and loosely install the nut,
but do NOT tighten the nut at this time. Insert the pivot arm assembly into the mounting
bracket. Do NOT snap the assembly closed, as you will need to access the mounting
bracket in the next step.
Inserting the Pivot Bolt
Mounting the Assembly to the Transom
Transom Mount - DualBeam™ PLUS
Inserting the Pivot Arm Assembly
NOTE: If the pivot assembly is snapped closed
over the mounting bracket, use a flat head
screwdriver or similar tool to gently pry the
assembly away from the mounting bracket.
4. Align the mounting bracket transducer assembly
with the drilled holes in the transom. With a 5/16"
socket driver, mount the assembly to the transom
using the two #10 - 1" long screws provided.
NOTE: Make sure that the mounting screws are snug,
but do not fully tighten the mounting screws at this time
to allow the transducer assembly to slide for adjustment
purposes.
5. Snap the pivot arm down into place.
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Into the Mounting Bracket