Its a circular wound moist all around and at a closer look you will notice movements within the wound. The diameter of the wound will gradually enlarge. The worms can also be visible within the wound.
it look like a round worm
it looks like a normal worm there's no difference
linear distance moved by the gear(worm,screw jack) for one rotation of the gear(worm,screw jack)
a bit like a worm
They look like a snake.
it is ugly
A rattlesnake.
because they look like worms accept they are grey and herbivore. (plant eater)
A worm drive.
a willy worm looks like a catarpillar with black "spikey fur"
It looks like a flying red worm
Not all screw jacks are driven by worm gears. Instead of a worm gear it can also be hydraulically operated. It is used because of the property of self locking. A Screw Jack Can be operated by electrically or manually. Electrically-powered screw jacks can save manpower, and control the linear speed.