Eagle Electronics FISHMARK 640C - Manual (Page 22)

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Assemble transducer and bracket.
3. Assembling the transducer.
A. One-piece bracket: Once you determine the correct position for the
ratchets, assemble the transducer as shown in the following figure.
Don't tighten the lock nut at this time.
Assemble transducer and bracket.
B. Two-piece bracket: Once you determine the correct position for the
ratchets, assemble the transducer as shown in the figure in step 2B.
Don't tighten the lock nut at this time.
4. Drilling mounting holes.
Hold the transducer and bracket assembly against the transom. The
transducer should be roughly parallel to the ground. The trans-
ducer's centerline should be in line with the bottom of the hull. Don't
let the bracket extend below the hull!
Nut
Metal
washer
Metal washer
Bolt
Rubber
washers
Flat washer
Lock washer
Flat washer
Nut
Bolt