Your thumb should rest comfortably on the top of the handle.

But as he had ordered, her thumb rested on it still.

I'm still having to kind of figure out how to hold it so that my thumb or a finger can rest on the buttons.

Just above where my thumb naturally rested there was a little catch.

The thumb then rests underneath the ball about in the middle of the two fingers.

The thumb is held clear of the ball, or rests lightly on the seam.

His thumbs were resting at the bases of the push buttons.

His thumb rested on the top of the grip.

His hand pounded, but his thumb rested against the catch.

The thumb resting against the side is up to the bowler, but should impart no pressure.