Anyone who ever reads back through this thread & has trouble using the GVG, this description is fool proof,  it even worked for me

The GVG is great, i tried my first bit of changa in it the other day, very very smooth, on the first toke i didn't even realize i took anything until i started feeling the rug being swept from underneath me...

I also trimmed/fitted a volcano liquid pad yesterday, very easy to trim with scissors, i trimmed the edges to a small circle to fit in the bowl & ended up with about half the original pad, then pushed it down into the GVG bowl. It fits snugly as it's very malleable, i can't see any reason why it would leak DMT apart from if while inhaling you heated it to melting point & not vaporization point, although i have yet to try it....