Dajibash, I know that can be frustrating as hell. I have had a few pipes that wouldn't allow a cleaner all the way through. My mistake for not running one through before buying, but sometimes you just assunme it will work as it's supposed to.
My last one that did that was a Butz Choquin Jumbo bent. It cost me $35.00 new, purchased on line. No matter what I tried, it wouldn't accept a cleaner all the way to the bowl.
I liked the feel and shape so much that I contacted a pipe repair shop and sent it to them for correction. I forget the shop now, but I was told that they recieve a lot of this type of request, especially from full bent pipes.
It cost me $15.00 plus shipping to get it corrected. Now it is working like it's supposed to. So now I have a $50.00 pipe that smokes and handles great.
Go online and contact several repair shops and get an estimate if you really like the pipe.