I have a Vinator and use it every time I bottle. But I had a very hard time putting it together because the spring would not seat to the bottom of the plunger tube. So then when I would assemble the device the spring would not stay centered during use. So after trying everything I could think of, I finially cut about an inch off the spring. It went together perfectly and has worked time after time. I believe that I saw a post from another brewer with the same issue.