See also:

Weights
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Fuel filler flap
Opening 1.  Open the fuel filler flap. To do so, lightly press the rear edge. 2.  Turn the fuel cap counterclockwise. 3.  Place the fuel cap in the bracket attached to the fuel fille ...

Shoulder support
Also supports the back in the shoulder area: Results in a relaxed seating position. Reduces strain on the shoulder muscles. ...