Imeo,
I did as you told me to do, screw, unscrew hard several time the adapter onto the AVS. there is no left over piece of metal it fits ok. But what I do think is the following
The juice control ring is very loose and it very easy adjusts it´s setting when you attach the adapter including the attie to the AVS. what happens is that the control ring loosens and takes another setting then initially set. So in short, the idea is great, but the way it is made is not so good as it easily changes and therefore leaks. All is well when in beta stage, but spending another 24 euro´s on something like this is not so good IMHO... I know you mean well, that is not the point, you are a good man, but in terms of having a 100% fool proof solution, you have to rethink and have it tested properly prior to selling it.