Filter that fits in the ball doesn't fit well, makes a clicking noise when you move the cleaner forward and blocks the ball when you pull it back - I cleaned the old filter carefully and reused it. If I took my time I could probably figure out which part of the plastic case was too big and clicking, but I've got better things to do than fiddle with something that should have worked from the start. The last order I will be placing is for this aftermarket filter kit.