Mercedes-Benz 300 SL Operator's Manual page 122

6. Place soft top bow (4) in vertical
position and soft top frame (5) onto
windshield header.
7. Pivot sun visors to side.
Remove left and right caps (6).
8. Using Allen-head wrench, lock left
and right of soft top frame (5) to
windshield header - turn wrench in
3 stages towards center of car:
1. Left lock to first notch
2. Right lock to second notch
3. Left lock to second notch.
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