Panasonic SA-BTT775GA Service Manual page 80

Step 9 Align the grooves of the Slide Cam with the bosses of
the Mid Base.
Step 10 Hold the Slide Cam, slightly pull backward the Mid
Base and insert it into the grooves of the Slide Cam.
Caution: Ensure the bosses on the Mid Base is seated
properly into the shaft of the Slide Cam.
Step 11 Push and press the turning shaft of the Mid Base side-
way, a "click" sound is heard when is fully insert.
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