I acquired a system pipe and have been cleaning it but not sure why but the draw is a little tighter then my other Peterson Plip pipes. The stem has a wider section towards the bottom and wondering how I can clean it.Is there another way of cleaning instead of using a pipe cleaner. I'm just wondering if the wider part is actually a chamber or is the inside of the stem just a straight tube if that makes sense. I checked the draft hole as well and it's clear so not sure why the draw is tight. Can someone help as I have searched here and google and no luck