Base Bulges out & Pumping Issue

Dear All,

Whenever, I do vacuum pumping, my base area bulges out from the base, where pubic pad and cylinder opening meets and then bulges area slips into the cylinder. I don’t know why it happens. I used a rubber ring which is small in circumference at the opening of the cylinder, but the base of the area still slips in the cylinder from the base and moreover, How to avoid base ball bat effect after pumping, because pumping leaves the symptoms of Base ball bat effect after pumping.

By baseball effect I take it that you are getting a donut? How much pressure are you using? How long have you been pumping? How long are you pumping for? What is your base girth compared to the cylinder tube you are using? Need more info to help you out.