![]() The problem is a difference in air pressure between the air in the ink reservoir and the air outside of the reservoir, in this case in the cabin of an aircraft. This isn’t usually a problem with modern fountain pens, as materials technology has improved a lot since then, but you should still be wary of using a fountain pen in flight. Safety pens were originally designed in the early twentieth century to allow them to be carried on an aeroplane without leaking. You’ll find a comprehensive, unofficial guide to the Pilot Parallel here, including details of how to convert it into an eyedropper pen. ![]() Convert the pen into an “eyedropper” pen, allowing you to use the whole barrel as a large reservoir.Refill an empty cartridge (using a syringe fitted with a blunt needle).Buy a Pilot converter that allows you to fill through the nib.In order to use bottled ink, you need to do one of the following: Pilot Parallels are cartridge pens, and they use Pilot’s own bespoke cartridge (not the standard international fitting). It also helps that the pens are not expensive to buy. This means that you can put Indian ink in a Pilot Parallel without worrying about the pen. It is often enough to wipe between the plates with the supplied tool (a thin rectangle of flexible plastic), but if that fails, the whole pen can be taken apart and you can clean each part, including the bare plates, separately. ![]() In a parallel plate design, the capillary action takes place between the plates. In a conventional fountain pen, the feed presents a problem, because, no matter how far you disassemble the pen, you just can’t get at the narrow capillary channels. The design has the added benefit of being easy to clean. Instead, it works by drawing the ink between two closely fitted parallel metal plates. It’s called a fountain pen, but it hasn’t got the traditional dip-pen style shape, and it hasn’t got a separate feed. It’s got that squared off tip for broad strokes (available in four sizes, from 1.5mm to a huge 6mm). Pilot designed the Parallel as a calligraphy pen.
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