Clamp the metal ends around a bottle top, crank the thumbscrew tight and turn.
From the ocregister.com
They attach at any screw-hole on the machine, using a short metal arm with thumbscrew.
From the en.wikipedia.org
They attach to the machine's pillar access port underneath the round cover, sharing its thumbscrew.
From the en.wikipedia.org
After all, it wasn't as though we didn't know about, say, the technology of the Inquisition, the rack, the thumbscrew etc.
From the guardian.co.uk
It was time Berlusconi went but I am not so certain that his replacement will do anything else apart from tighten the thumbscrew more for the public.
From the bbc.co.uk
Saeed Ajmal, torturer in chief of England for two long months, gleefully turned the thumbscrew, not to mention the doosra, one final time.
From the independent.co.uk
Fortin barometers use a variable displacement mercury cistern, usually constructed with a thumbscrew pressing on a leather diaphragm bottom.
From the en.wikipedia.org
But tests involving a device resembling a medieval thumbscrew show that women, too, take longer to report pain when their tormenter is female.
From the newscientist.com
Rome is still Rome, however, ready to enforce the new dogmas with some of the same thumbscrew pressure that it once used to enforce the old.
From the time.com
More examples
Instrument of torture that crushes the thumb
Screw designed to be turned with the thumb and fingers
A thumbscrew is a specialized type of screw with either a tall head and ridged or knurled sides, or a flat, vertical head. They are intended to be tightened and loosened by hand. They are often cut for Phillips head or slotted screwdrivers as well.
The thumbscrews or pilliwinks is a torture instrument which was first used in medieval Europe. It is a simple vice, sometimes with protruding studs on the interior surfaces. The victim's thumbs or fingers were placed in the vice and slowly crushed. ...
A self-locking ratchet style front hold down normally used for ARINC 404 equipment (See ARINC 404 Hold Down Guide and ARINC 600 Hold Down Guide).