The term 'PART OF A PINBALL MACHINE' can be broken down into two crossword solutions: BUMPER (6 letters) and COINBOX (7 letters). A BUMPER is a device found on a pinball machine that is designed to propel the ball away from it when hit. It is usually made of rubber and is often brightly colored. A coinbox is a box located on the side of a pinball machine that holds coins or tokens used to play the game. It is typically secured with a lock to prevent theft.