thumbpiece

thumbpiece

(ˈθʌmˌpiːs)
n
a piece that is pressed by the thumb, for example on an instrument or on a lid so as to open it
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
This revolver sports what Smith & Wesson calls a "classic style thumbpiece", otherwise known as the cylinder release.
The new Model 19 Classic uses a cylinder release thumbpiece shaped like that of the original Model 19.
It both presses forward on the selector block, disengaging that part from the sears, and lowers an interceptor from the underside of the tang just below the thumbpiece of the top lever.
A half-gallon straightsided pewter flagon, made in York in about 1700, with a ram's horn thumbpiece. Estimate: PS 1,200 - 1,800.
Additional features include a vented, ribbed barrel, PC speed release thumbpiece, an interchangeable front sight (orange included), PC tuned action and more.
$111,000) while the 'Sporting' over and under design with quick-detachable selective single trigger-lock assembly, top lever opening, with non-automatic thumbpiece safety incorporating a barrel selector, begins at GBP 45,000 (approx.
Sporting pinned partridge front sights, wide classic thumbpiece, and checkered square-butt walnut grips, along with a 6 1/2-inch barrel--arguably the best N-frame barrel length ever.
Such examples are two rare George II flagons dating from the second quarter of the 18th century, each with a hinged lid operated by a scrolled thumbpiece.
Draw the hammer to the cocked position (you'll have to pull the thumbpiece to the rear), then lift it from the frame.
Even complicated shapes like the thumbpiece inlays show no gaps, looking as if the wood grew around them.