Dont know the model but have seen these tables without a ball return. If your handy at all and have access to drill/jig saw/router you can cut holes in the sidewall and fabricate ramps with railings to return balls to those holes. If I were to do that I would have a hole on each side and have the ball return to the side that scores. Example: yellow scores into black goal, ball returns to yellow. Same for black. Reasoning: two people could practice shooting drills at the same time and have the ball return to themselves. If you'll never (or rarely) be in that situation have both ramps return the ball to yellow.
Or you can just pick the ball out of the goal each time and call it a day.
I like how the bottom has playfield graphics on the bottom. Misalignment on the printer/roller, oops... flip it over and run it again.