how can i change the weight of a bowling ball?

i bought a Bowling ball at a garage sale fairly cheap. i like the ball, but it is too heavy for me to throw. i want to know if there is a way to change the overall weight of the ball. perhaps dropping it down a couple of pounds.
i want to change the weight so i dont have to buy another one. not for the purpose of cheating like some morons might think.

That’s cheating. It’s heavy for a reason.

EDIT: Moron? That’s a stretch >:( Literally, it’s cheating whether you change the weight to make it heavier OR lighter. It’s regulation for a ball to be a certain weight, if it is not made to that desired weight it’s disqualified from play.

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