Opening a stem?

[Emperor Zurg]

I'd use a drill bit. I wouldn't try to melt my way thru it. The taste of melted acrylic or melted vulcanite would be nasty. I'd take a 5/64" (or so) drill bit and wrap some masking tape around the shank for a little better grip and turn it by hand.

[OnePyroTec]

Once in a while I will use a drill bit with a counter sink to open the airway then a slot tool for opening up the slot at the tip.

[Will46r]

Most hardware stores carry jewelers files. I actually have better luck with the $3 harbor freight pack than my more expensive ones. I have dozens I have ground down for different knife making processes.

[mooster]

I was thinking of jeweler's files.... I have several sets, one of those things where I assume everyone has em lol

I can relate to that. Someone told me the other day that they didn't have a set of jeweler's screwdrivers and I looked at him like he was an alien life form...

[NeverBend]

Be very careful when using or creating heat with stem materials. Vulc tends to suddenly 'boil' or melt and lucite (acryliic) becomes unstable.

Your preferred method should be the one that scratches or scores the interior of the stem the least. The more rough surface inside the stem the more trapping of tars, moisture and taste (that can becomes foul).

Pipe manufacturers all use drill bits, often (usually) with a jig to hold the stem in place. I have seen one use a sandpaper string to clear debris (super fine grit).

Remember, with any tools that the pressure alone can cause damage to the stem.

Good Luck.

Pete