wowwww. dont be a dick mane. Let this dude have his moment. hitler, cyanide n all that shit, not cool.
Are you raving about a 2 month old post? And it still doesn't change the fact that it's hazardous to your health to smoke plastic fumes, "mane". Yeah- cyanide "and all that shit" isn't cool when you die from active cyanide poisoning and start foaming at the mouth because he wanted to inhale pen tube smoke while you gave him his "moment" "mane". Ignorance knows no bounds! Anyway, hope you found a metal downstem OP, if so- then great ingenuity (even 2 months later). wowwwwwwwww mane.
Try those aluminum straws they have for big gulps at 7/11 or Home depot, Lowes has brass tube'n that works really good with a aluminum slide and snapper bowl. Used to make Graffix style bongs all the time like that.
I saw your problem and instatly thought of the tube of a BBQ lighter would work perfectly like one of these http://www.madchef.com/images/lighter.jpg just prey the plastic off and then make your bowl fit.. Be easy