In the top right hand corner of my Power Flash Thunderbird machine the rubber bumper/stop that the ball hits when it reaches the end-point point of the top arc appears to be dry and offers no "bounce" to the ball. Is it supposed to?

Thus the ball seems to always drop right below that rubber stop no matter how forceful or easy I launch the ball. What happens is that the ball never winds up bouncing back over to the top left side of the playing field, only on the right and only right below that rubber piece. That can't be correct.

Is that rubber piece replaceable from any source? Or does one have to fabricate something on their own? Also, what is it correctly called? (I try and avoid using words like "thingy")
Thanks
Eddie
Rubber Bumper Dry.jpg