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How to Hack a POSCA

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uniPOSCAs are great pens, but the biggest range of colours is only found in the big 8mm chisel-tipped marker pen. Some of us want fluorescent pink with a 1mm tip (nib), especially since Sharpie poster paint pens are difficult (impossible?) to get hold of in the UK.

So here is a hack for converting an 8-mm chisel-tip into a 1-mm round-tip for that writing, doodling and drawing in your artist's journal!

Materials you will need:

New uniPOSCA pen [PC-8K] of the colour you want to hack (you could try one that's been used - it'll be pretty messy - I haven't tried that yet...let me know how you get on!)
Piece of masking tape
Pencil
Ruler
Fine bradawl, or big needle (or possibly a fine drill + drill bit [1.5mm?])
Some 1-mm replacement tips (I used Zig Kurecolor fine ones [KCS-F1])
A very sharp craft knife.

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STEP 1 - PREP THE BROAD TIP

This is how your brand-new uniPOSCA looks when you first unwrap it.

STEP 2 - PREP THE FINE TIP

Here are the new, 1-mm replacement nibs/tips:

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Cut one of the fine nibs/tips off at around 6 or 7 mm behind the 'head', which you write with; ie the total length of the new tip is around 13-14 mm (longer may be better as the new tip will be less likely to come loose). I also whittled the stem slightly to a point - I thought it would push into the hole in the broad tip more easily.

STEP 3 - PUTTING THEM TOGETHER

Leave the masking tape on the broad stump for now and use a bradawl or needle (or drill? - the fibrous material is prone to cracking and I wonder whether a drill, by removing material, would reduce this risk) to make a hole into which the fine tip will push. You've only got one chance at this, so try and do it centrally, perpendicular, and not too big: the new tip needs to be pushed into the hole tightly enough that it won't wobble or come out when you start to write with it!

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Next, push the fine tip firmly into the hole in the stump, and remove the masking tape gently - some fibres will come off on the tape, but this doesn't matter.

Finally, gently push the new assembly back into the pen. You can see that there is about 2 mm of old broad tip (stump) showing beyond the body of the pen.

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To charge the new nib, I shook the pen, then pressed on the stump gently a few times (I didn't want undue pressure on the fine nib - worried about it coming loose). The ink took a couple of minutes to fill the whole new nib assembly

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WARNING!
When you push the nib into the body of the pen far enough, it releases a flood of ink: since the new assembly may be fractionally wider than the old broad nib, it may get stuck in the 'flood' position and leak. Simply pull it out so that 2-3 mm of stump can be seen beyond the pen body. Since I worked that out, I haven't had any leaks - but I'd always shake the pen with the cap on, just in case!

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