Teaching a Junk-Drawer Nib to Remember Blue

Fountain Pen Restoration

Forty hobbies in, and the pattern recognition has become almost automatic. When I watched someone tuning a nib at the maker space last week—adjusting tine alignment under magnification while testing ink flow on scratch paper—I recognized the diagnostic loop immediately. It’s the same cycle I use when debugging RF issues: observe, hypothesize, adjust, test. The medium is different. The method isn’t.

The $5 Esterbrook J from the junk drawer is now sitting under a jeweller’s loupe, and I’m learning that nib tuning is where fountain pen restoration gets precise.

How a Nib Actually Works

A fountain pen nib is a controlled leak. Ink moves from the reservoir through the feed (a finned piece of plastic or hard rubber) to the underside of the nib, then down the slit to the tip via capillary action. The slit is the critical geometry: two tines of metal, meeting at a point, with a gap narrow enough to hold ink against gravity but wide enough to release it under the friction of paper.

When that gap is wrong, everything fails.

CROSS-SECTION OF NIB TIP (greatly exaggerated)

        Left tine    Right tine
             \          /
              \   slit /
               \  |   /
                \ | /
                 \|/
              tipping material
                  ·
                paper

The tipping material—universally called “iridium” despite containing no iridium since the 1950s—is a hard alloy bead welded to the gold or steel tines. It’s what actually touches paper. When the two halves of that bead are misaligned vertically, one tine digs into paper while the other floats above it. The pen scratches. When the tines are too close together, ink starves. Too far apart, it floods.

Diagnosing Tine Alignment

Under 10× magnification, a properly aligned nib looks like two halves of a single sphere meeting at a hairline seam. You’re checking three things:

Vertical alignment: Both tines should contact paper simultaneously. View the nib head-on. If one tine sits higher than the other, the lower one will catch paper fibres.
Horizontal alignment: The tipping material should form a continuous curve across both tines. Twist misalignment makes the pen write differently on push strokes versus pull strokes.
Slit width at tip: The gap between tines at the very point where they meet paper. This controls ink flow. Vintage pens often arrive with tines pressed together from decades of pressure—“sprung” in the wrong direction.

I spent an embarrassing amount of time on step one before realizing the loupe position mattered. Like checking tyre pressure from the wrong angle. The nib has to be directly facing you, not tilted, and the light source behind your shoulder.

The Adjustment Sequence

This is the part that requires commitment. You’re bending metal.

For vertical misalignment (one tine higher than the other):

Place the nib on a hard, smooth surface—glass or polished steel. Apply gentle downward pressure to the high tine with a brass shim or smooth metal rod. Brass is softer than the nib alloy; it won’t scratch. Push, check under magnification, repeat. The movement you need is measured in fractions of a millimetre.

For tines too tight (hard starts, skipping):

Insert a brass shim (0.05 mm or thinner) between the tines at the breather hole. Gently slide it toward the tip. This spreads the tines incrementally. The goal is to open the slit just enough that ink flows by capillary action when the nib touches paper. Too far and you’ve created a fire hose.

For tines too loose (flooding, ink drops on page):

Squeeze the tines together by pressing on their top surfaces, near the tip, with thumb and forefinger. This is coarser adjustment. Check after each press.

The feedback loop here reminds me of the threshold tuning in the Meteor-Scatter Shutter Triggers—adjust a parameter, test, adjust again. Except there’s no undo. Overbend a tine and you’ve added “buy another pen” to the project scope.

The Test Protocol

After each adjustment:

Dip the nib in water (not ink—easier to clean if you’re still iterating)
Write figure-eights and figure-fives on cheap copy paper
Check for skipping, hard starts, and uneven line width

Figure-eights test all stroke directions. Figure-fives add a sharp transition. If the pen writes wet, smooth figure-eights but catches on the crossbar of the five, you still have alignment issues.

The Esterbrook J needed vertical alignment correction—left tine was visibly high under the loupe. Two careful presses with a brass rod, maybe 30 seconds total, and the scratching stopped. Then I switched to ink, wrote a full alphabet, and watched blue lines appear from a nib that hadn’t written since someone stored it badly in 1962.

There’s a precedent in this collection for turning dead data into live output. The QSO Radial Coasters turned radio contacts into physical geometry. This is smaller and stranger: I’ve turned a mechanical failure into handwriting.

The pen cost five dollars. The sac kit cost twelve. The loupe I already owned. But the real cost is attention—learning to see a gap measured in hundredths of a millimetre and knowing which way to push.