[Rosance]

And this is how the inside of the dome looks like with it attached. As you can see, it fits perfectly. There are edges that do not touch the domes, which enables the air to be sucked out. HOWEVER, once you start to outgrow the area you have available, those edges scratch the skin and that is not very pretty That is the time you will have to remove them and continue without any, find another container, or maybe (have not tried it) even cut more from the old stopper (bottom of bottle) to make it rest deeper in the dome. Right now I am removing them without putting any stoppers. It has reached to the point where they are hurting me, I guess I have outgrown them.