I have a Moen soap dispenser in my kitchen sink (with the soap reservoir that screws in from underneath and the dispenser/tubing contraption slides in from the top).

I slid the dispenser/tubing contraption out to clean it. I disconnected the dispenser part (the knob with the spout) from the tubing. Now, after putting it back together, it doesn't pump soap. I think, however, that a little ball bearing fell out b/t where the tubing contraption connects to the underside of the knob. Could this by why it doesn't have enough suction power to dispense soap? Is all I need to put a little ball bearing back in there?

If so, where do I get little ball bearings (looks like a BB from a BB gun).