Getting the tar out of one's pipe is messy and unnecessarily difficult. The reason for this is that the tar is thick and viscous and it's stuck in a skinny little tube.
I saw on TV how a South American blow-dart tube was made, and I thought, Aha!
Split the tube lengthwise, re-attach the two halves,
and you have a two-section pipe stem which can be taken apart so that the tar can be easily scooped out.
The two halves could be held together by a dove tail joint.
Am I explaining this well enough?