Did any BKs come from the factory with anything to protect the plastic that sits over the ball lock trough in the upper playfield? Pretty much every BK I've seen has had that plastic cracked or broken, along with playfield wear just below the trough. Somebody had fashioned a homemade metal protector to sit under the plastic for mine, which I'm going to rework. When the balls are kicked out of the trough, is it normal for them to hit the underside of the plastic? Just curious.