wick ②core ③pistil (of a flower) ④stamen

cardboard tube

lead of a pencil

dead center

thick obi sash

padding

spare pencil lead

apple core

wick of a candle

staple (for a stapler)

collar core (stiff fabric, etc. inside a collar)

lamp wick

mechanical pencil lead

dead center (of a baseball bat)

pencil lead case (for a mechanical pencil)

toilet drain outlet

mentally strong

lead pointer (for a clutch pencil)

to get to the heart of the matter ②to hit (a ball) with the sweet spot (of a golf club, baseball bat, etc.)