Purchased from an estate. Do not know anything about them or how they work. So I plugged it in and could hear the fan motor come on and soon one of the balls came up the tube. So I kept going and eventually they all came up. I did have to shake the machine a couple time to get them all to come up. I saw a few leaves in the inside. So maybe a good cleaning would improve the situation. Only serious buyers that will show up. Porch pickup in a nice safe subdivision, just outside of town, right off the interstate. Accept cash paypal venmo cashapp.