Capillary tubing for Schuemann box

I'm working on restoring a Schuemann netto box and I'm in need of a
couple feet of 0.010" ID plastic tubing to make a calibrated leak to
match the netto to my sailplane polar. There are products available,
but generally sold in quantities much larger than I need, and not
inexpensive (sold mostly for bio-medical applications).

The inside diameter is fairly important, as the flow resistance at
constant length goes as the 4th power of ID. The desirable range is
about 0.008 - 0.012".

It's likely possible to use metal capillary tubing for this, which is
easier to find in small qty, but plastic would be much easier to work
with.

Anyone have a source?

Evan Ludeman / T8