He fumbled around a little before his hand encountered the proper little round knob.

Bumpers are round knobs that, when hit, will actively push the ball away.

But the thing only touched a round knob.

In the center was a round knob, sunk in the wood.

It had a round knob on the inner side.

There was a round knob on one side.

No head was visible; nothing but a lid with a round knob on the top.

Now, by using this little round knob which projects from the cliff here as a fulcrum, we may be able to lever it off.

No; but the little round knob that we used for a fulcrum.

The sleigh driver halted on a round cakelike knob, the summit.