Quoted from andrewket:WOW, thanks all. I removed the plastic which will get you access to 2 out of the 3 posts, but it looks like the upper play field will have to come up at least a tad to get the rubber around that third post.
Right, you have to lift it just enough to slip the new rubber onto the post, but you don’t have to remove it. You may want to turn the power down on that slingshot to reduce wear on the new ring.