How to Swap Nibs on a Kaweco Sport Fountain Pen
How to Swap Nibs on a Kaweco Sport Fountain Pen
Change your writing width, try a specialty nib, or rescue a bent tip — the Kaweco Sport makes nib swapping easier than almost any other fountain pen. Here is exactly how to do it.
The Kaweco Sport is beloved for many reasons — its pocket-sized silhouette, its octagonal cap, its sheer range of colours. But among enthusiasts, one feature stands out above all others: the nib is absurdly easy to swap. No tools, no heat, no disassembly tricks. Just a gentle pull and a firm press, and you have a completely different writing experience.
This guide covers everything — why you might swap nibs, which nibs are compatible, how to do it cleanly, and what to watch out for.
Kaweco AL Sport Fountain Pen — the nib unit is identical across all Sport-family pens.
Why Swap Nibs on a Kaweco Sport?
Most fountain pen owners buy one pen, use one nib for years, and never consider alternatives. Kaweco Sport owners tend to think differently — because once you know how easy the swap is, you start collecting nibs the way other people collect whole pens.
Common reasons to swap:
- Change line width. Kaweco offers EF, F, M, B, and BB in their standard round nibs. If your handwriting is small, an EF gives you precision. If you journal expressively, a B or BB puts bold ink on the page.
- Try calligraphy. Kaweco's 1.1 mm, 1.5 mm, and 1.9 mm stub nibs produce the broad, flat strokes used in italic calligraphy — without buying a dedicated calligraphy pen.
- Match the ink. Some inks — heavily shading, high-saturation, or slow-drying — show up best on a broader nib. Swapping lets you optimise the pairing.
- Repair a damaged nib. If a nib gets bent or the tines splay, swapping in a fresh unit is faster and cheaper than sending the pen for repair.
- Share one body between nibs. Many writers own one Kaweco Sport body and several nibs — swapping between them depending on the task, rather than buying multiple complete pens.
The Kaweco Skyline Sport Ocean Blue — a Singapore & Malaysia exclusive at Cityluxe.
Which Nibs Are Compatible?
The Kaweco Sport uses a standard #5 international nib — the same size used by many other brands. The nib and feed sit together as a single snap-in unit inside the section (the grip area).
✅ Fully compatible (drop-in swap):
- Kaweco Classic Sport nibs — EF, F, M, B, BB, 1.1, 1.5, 1.9 stub
- Kaweco Skyline Sport nibs — same nib unit, same compatibility
- Kaweco AL Sport nibs — same unit again
- Kaweco PERKEO nibs — also #5, compatible
- Any Kaweco pen in the Sport family shares the same nib unit
Note: While some third-party #5 nibs will physically fit, Kaweco's own replacement nibs are the safest choice. Third-party units may vary slightly in feed geometry, affecting ink flow. For most users, sticking to genuine Kaweco nibs is recommended.
The Kaweco Sport nib unit — nib and feed in one piece, seated by friction only. No tools needed to remove it.
How to Swap the Nib — Step by Step
⚠️ Warranty notice: Swapping the nib yourself is considered user modification and will void the manufacturer's warranty on your pen. If your pen is still under warranty and you experience issues, contact us at Cityluxe before making any changes.
The entire process takes under five minutes. You do not need any tools.
Empty and clean the pen
If there is ink in the pen, empty the cartridge or converter and flush the nib and feed with room-temperature water until the water runs clear. This prevents ink mixing when you install a new nib. If you are swapping to try a different ink, cleaning is essential. If you are swapping back to a nib that held the same ink, you can skip deep cleaning — but a quick rinse is still good practice.
Unscrew the section from the barrel
Hold the barrel in one hand and grip the section (the front grip area) with the other. Turn anticlockwise. The section will unscrew cleanly, exposing the cartridge or converter. Remove and set aside the cartridge/converter so it does not fall.
Pull the nib and feed unit straight out
Grip the nib firmly between your thumb and forefinger — holding the sides of the nib, not the tip. Pull straight back along the axis of the section. It will resist slightly (it is a friction fit) then release cleanly. Do not twist or wiggle; pull straight. The nib and feed come out together as one unit.
Press the new nib and feed unit into the section
Orient the new nib so the tines face the same direction as the grip flat (the flat writing face of the section). Press the unit firmly and evenly into the section until you feel it seat with a slight click or resistance. It should sit flush — not proud of the section lip. Check by looking at it from the side.
Reinstall the cartridge and screw the section back on
Press the cartridge or converter back onto the nib feed, screw the section into the barrel (clockwise, firmly but not forced), cap the pen, and let it sit nib-down for two to three minutes to allow ink to reach the new nib. Then write a few strokes on scrap paper to prime the flow.
Tips and Common Issues
Nib feels loose after installation
Press it in more firmly. The fit should be snug. If it still feels loose, inspect the section for any debris or damage to the nib seat.
No ink flow after swap
Let the pen sit nib-down for five minutes. If flow still doesn't start, remove the section and check the cartridge is fully seated onto the feed post.
Nib is very hard to pull out
Soak the section in room-temperature water for 10 minutes to loosen dried ink that may be acting as glue. Then try again with firm, straight pressure — no twisting.
Ink mixing between nibs
If you swap frequently between different inks, store each nib unit in a small zip bag with a label. A quick water rinse before swapping back keeps colours true.
Kaweco Nib Size Guide — Which Should You Choose?
| Nib | Line Width | Best For |
|---|---|---|
| EF | ~0.9 mm | Small handwriting, technical notes, minimal ink use |
| F | ~0.5 mm | Everyday writing, planners, general use |
| M | ~0.7 mm | Journaling, showcasing ink shading, comfortable flow |
| B | ~1.1 mm | Bold journaling, wet writers, slow-drying inks |
| BB | ~1.3–1.4 mm | Signatures, expressive writing, very wet inks |
| 1.1 Stub | 1.1 mm flat | Italic calligraphy, greeting cards, line variation |
| 1.5 Stub | 1.5 mm flat | Calligraphy practice, bold italic lettering |
| 1.9 Stub | 1.9 mm flat | Display lettering, wide calligraphy strokes |
Note: Kaweco nibs are German and run considerably broader than Japanese nibs. A Kaweco EF (~0.5 mm) is comparable to a Japanese M; a Kaweco F (~0.7 mm) writes like a Japanese B. Size down one or two grades if switching from Japanese pens.
Kaweco Calligraphy Sets include 1.1, 1.5 and 1.9 mm stub nibs — all compatible with the Sport body.
Frequently Asked Questions
Cityluxe · 601 Sims Drive · Singapore · Pen personalisation · Kaweco Sport
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