Fun additional Arizer Solo safety concern.
AFAIK this hasn't come up before, but I was looking closely at my only-used-once, gotten-by-trade glass PV stealth adapter, and I noticed the 4 intakes holes had ragged, super thin glass ends where they were blown out which I could easily break with the smallest nudging of a thin skewer. I don't know if PV makes their stems from Arizer Solo stock pieces or if they have another source for the bowl portion, but this adapter is in what I consider to be dangerous condition.
One way to make a hole in glass, the way done here, is to heat a small area of a glass tube with a flame and then blow air through the connected tube until that small area explodes out into the torch flame. This can leave jagged glass edges of varying sizes and even tinier glass fragments called "bubble trash" by lampworkers. Someone doing a good job will make sure those thin, delicate, potentially dangerous segments get hit with a torch and then condense down back into the surrounding glass harmlessly. This one PV stealth adapter stem did not have such treatment, and I'm going to clean it thoroughly, take it to the shop, cut it off near the offending area so I can correct the problem, and then will probably put a 14mm joint on it while also making some indentations for better airflow.