The alternator produces electricity by rotating.

The piston reciprocates as it rotates.

When the studs (12) aren't needed they are retracted by twisting the twist sleeve (12) back again.

ploughing on the square commencing at the centre

roundabout ploughing starting from the centre

Tossing and turning, you just can't fall back asleep.

roundabout ploughing starting from the outside

ploughing on the square commencing at the outside

The hammer (41) strikes against the anvil (46) in a rotational direction of the hammer (41).

Praise the Lord," around and around the tree like that.

Avoid quick movements of the head (especially turning or rotating).

Avoid rapid head motion (particularly twisting or turning).

But as much as you toss and turn, you just can’t fall asleep.

Avoid rapid head motion (especially turning or twisting).

Stabilizing of the upper frame is done by turning handlebars.