Wot do u mean? You forced the cap into the atty ? (I can't make out pic).
The closest thing I can relate is the
ZFM (zero filler
mod), where a cut-out is made of the silicone material ,punched with a hole and pushed into the cart, propped up with a straw inside.
I think somebody implied that the cart would melt before the silicone would (but I have my doubts about that.