Lowrance X-4 Installation And Operation Instructions Manual page 14

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 transduc-
er's centerline should be in line with the bottom of the hull. Don't let
the bracket extend below the hull!
Nut
Rubber
washers
Assemble transducer and bracket.
Bolt
Flat washer
Assemble transducer and bracket.
washer
8
Metal washer
Bolt
Lock washer
Nut
Flat washer