Just received my first pipe so I'm pretty excited. I ordered it online and received some filters with it as well. The filter fits easily in to the bowl end but is too large to fit in to the stem side. The filter is a 9mm and it is the same size as the part that screws in to the end of the bowl. Is there some way to make these fit or did I receive the wrong size filter and should grab some 6mm ones? Thanks for any help you can give.