Chinrester ?Not a P lip but I smoked a pipe this way a few weeks back and posted a photo here
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I never even thought of that down side.I've accidentally started a pipe with a straight stem p-lip upside down.
K’NEXI haven't tried your method, but I have tried mixing different stems to pipes and had some interesting results. I put a straight army mount pipe into my Pub Pipe and vice-versa. You'd be surprised at what you can make!
I am really curious about them. I have never smoked one. And just the fact that people feel such mixed things about them.I just don't like system pipes.