This is a topic that’s been widely covered but I wondered if people might be willing to go over some of this ground again. My questions start here: What are the features of the very highest quality vulcanite factory stems? I’m curious about English pipes throughout history and whether standards changed and how much attention was paid to the top of the line stems and what makes the best ones great. I’m curious generally about comparing high-end factory stems to artisan stems. Are they comparable?