Got yourself a real noggin scratcher on your hands huh... whatever i have 10 minutes to kill and a camera right beside me, so here you go if you really can't figure this out.
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I personaly wouldn't use this, expecialy with the pen in it. Definitly use a metal stem if you can, or better yet, go buy a pipe. The only homemade piece i ever hit, my g-bong bowl :rasta:
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hope this didn't give you a brain hemorrhage :thumbsup: