Opening a stem?

[Tobias Lutz]

How far do you need to open it? Perhaps a tapered round file would work better.

Only about a 1/32" to 1/16", but where do you find a file that small?

[Branzig]

Only about a 1/32" to 1/16", but where do you find a file that small?

Didn't even think of a file!

Lots of jewelers and watch makers use micro files. You'd have to order them online though, unless you have an old time watch shop around that sells jewelry and watch making equipmemt.

Otherwise just google micro files