It takes up the "air gap" space created by the compression of the wood or plastic flange that the screw presses down on... This gap then allows the grip to float between the frame and inner surface of the screw head. The soft rubber of the O-ring will fill this space and hold the grip stationary without over stressing the grip. makes it FEEL like it still has a good fit.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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