thumbscrew


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thumbscrew

1. an instrument of torture that pinches or crushes the thumbs
2. a screw with projections on its head enabling it to be turned by the thumb and forefinger

thumbscrew

[′thəm‚skrü]
(design engineering)
A screw with a head flattened in the same axis as the shaft so that it can be gripped and turned by the thumb and forefinger.

thumbscrew

A screw having a broad head that is knurled or flattened so that it may be turned easily by the thumb and one finger.
References in periodicals archive ?
But despite its limitations, The Riot Club grips like a thumbscrew. The toffs are so fabulously, so relentlessly loathsome that you're unable to take your eyes off the screen.
Indeed, Turning the Legislative Thumbscrew is a remarkable piece of scholarship precisely because of the author's talent in aggressively testing his model in a number of different institutional settings.
But despite its limitations, The Riot Club grips like a thumbscrew. The toffs are so fabulously, uniformly and relentlessly loathsome that you're unable to take your eyes off the screen.
I eventually fashioned a small, cylindrical plug, inserted it into the thumbscrew hole, put the screw back in, and tightened it down snugly until the friction felt right.
If you look at the photo of the paddle lying on the lid (top right), you can see the centering hole as well as thumbscrew and setscrew arrangement.
Catherine's face reddens, as she blusters: "It's nobody - it's an invention!" However, my no-nonsense interview technique - and the application of a thumbscrew - eventually results in a more believable answer from the Hall Green-based author.
I placed the collimator extension on the lag bolt using the last slot and secured it with the thumbscrew. (You can make a similar extension from a piece of aluminum bar stock, but I had this extension on hand for bore sighting scopes, so it was available.)
The base includes a support-rod mount with a thumbscrew for rods up to 13 mm in diameter.
A small thumbscrew allows precise positioning of the tip spacing.
Thumbscrew sight glass fasteners provide solid lockdown and fast "no tools" horizontal adjustment.
While the hydraulic pressure temporarily secures the mold, a manual thumbscrew mechanically locks the clamp in the closed position so that the hydraulic power can then be released.
But its easy-sliding blade, which locks in place with a thumbscrew, gives this square lots of other uses besides.