PILOTFountain Pen Converter (CON-70)

Works as described. Easy to use.

using with pilot kakuno.... had zero issues. I bought syringes to refill with after reading some reviews saying the pump function doesn't work. mine worked fine. I ended up with quite a few air bubbles in mine. ... but it writes smoothly. far better with my new hongdian ink than the namiki disposable cartridges. I think the problem may also be removed by taking more care when filling it. i.e. making sure the nib is completely submerged... holding the pen either straight up and down, or at a slight angle. relieving the depressor very slowly.... I need to experiment.... I just pumped it 5 times at first and it barely filled it. did it probably 5-8 more times and then I felt one pump with slight pressure that wasn't there before and stopped. it definitely looks full. even if I do wind up having to use the syringes I'd be happy with this set up .. but unless I find out the airbubbles can't be fixed and are an issue I don't think there is anything bad to say. al

Purchased to replace cartridge use in a PilotLightning pen. I just now used it for the first time. It loads the ink a bit differently than other of my pens so I’m still learning. It did load some ink and the pen writes great!

It fit in the pen well. There was some leakage. However, it could've just been my pen's quality. The converter kept up with my writing speed. I don't think the value is great for the money I paid though.

The CON-70 converter is the most ink you can put into your Pilot fountain pen (except for piston filler or vacuum filler pens).CON-70 = 1.06 mlCartridge = 0.90 mlCON-B = 0.62 mlCON-40 = 0.61 mlThe CON-70 converter works similarly to a vacuum filler. Pushing the button down pushes the diaphragm down towards the mouth of the converter, and creates a vacuum behind the diaphragm. Near the end of the stroke, the diaphragm breaks contact with the interior walls of the converter tube, causing whatever in front of the diaphragm to get sucked back behind the diaphragm. When it's installed in the pen, and the nib is submerged in the ink bottle, it will cause some of the ink to get drawn up behind the diaphragm. Pushing the button down quickly (and then releasing it) three to five times will get you a nearly completely full filling. A little bit of air will always be there, but it should be less than a 5th of the total volume.I use mine in my Pilot Silvern pen; that pen comes with a CON-40, but you CAN put a CON-70 in it...as long as you remember to point the nib up before screwing the back of the pen back on. It's a little bit too long for that pen, and the button gets pushed in just a little bit. But since air rises to the top of a liquid, only air and some bubbles will come out of the nib. Just wipe it off, and write on.

For me, the Pilot Custom 743 just may be the perfect pen. Substantially the same design and the same nib of the much-vaunted Custom 823, but with a converter instead of the vacuum fill. I don't want a converter so small that I have to fill it after practically every writing session. Still, to paraphrase a 16th Century Italian playwright, 'One should do with lovers exactly as one does with ink colours*: Have many, enjoy them one at a time, and change often.'The CON-70 strikes the perfect balance between ink capacity and change frequency. It fills just fine through the nib and the button, but I find it less messy and more efficient to fill from an ink syringe (easily found on Amazon; I use a 1" needle). Filling from a syringe can lead to dry starts with cheaper pens or different converters, but with the CON-70 and No. 15 nib of the Custom 743 the ink flows immediately and it always writes like a dream without issue.I've seen some people recommend a different converter for each ink colour to avoid transfer issues. I simply use a longer syringe (3-4" needle that can extend to the very back of the converter, pictured) and completely flush out the nib and converter with water between fills. That can leave small water droplets in the CON-70 that could (in theory) dilute the ink in your next fill; you can either blow it out with compressed air or I just leave it to dry overnight. If you want to refill right away, it will likely be just fine a bit wet, or just have a spare CON-70 in reserve (hence why you are here!)The Pilot Custom 743, paired with the CON-70, more than live up to the hype. Happy writing!*the original quote says 'clothes' here. But it holds true for fountain pens, so Guarini will forgive me.

use this one for the kakuno pen. much easier to get filled that the nc-40.

It is my second time buying these converters at Amazon. In the first purchase the item, which was sold by saitaniya, was good.Unfortunately in my second purchase both converters sold by DigMartJP were arrived broken. The shipping package was intact thus the items must be defective before shipping. I will avoid this seller in the future.I returned them immediately.