Lowrance electronic M68C IceMachine - Manual (Page 22)

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Reassemble the transducer and bracket and place them against the
transom. Again, check to see if you can move the transducer so it's
parallel with the ground. If you can, then go to step 3. If it doesn't,
repeat step 2, but use a different alignment letter until you can place
the transducer on the transom correctly.
Insert bolt and check transducer position on transom.
3. Assembling the transducer. Once you determine the correct posi-
tion for the ratchets, assemble the transducer as shown in the fol-
lowing figure. Don't tighten the lock nut at this time.
Assemble transducer and bracket.
4. Drilling mounting holes. Hold the transducer and bracket assembly
against the transom. The transducer should be roughly parallel to the
ground. The transducer's centerline should be in line with the bottom
of the hull. Don't let the bracket extend below the hull!
Mark the center of each slot for the mounting screw pilot holes. You
will drill one hole in the center of each slot.
Drill the holes using the #29 bit (for the #10 screws).
Ratchets
Nut
Metal
washer
Metal washer
Bolt
Rubber
washers