I like a screw-on cap like this one. It comes with a converter so any bottle of fountain pen ink will be fine. and it writes very well for less than $10 . You can also get a matching rollerball for this one.
The Jinhao 517 is a little shorter and comes in black, blue or orange. It also comes with a converter for bottled ink, and the nib is a wee bit smaller in size and writes a narrower line. The 517 snap-on cap has a hinged clip to fit pockets in coats or vests. Its also a smooth writer and under $10, delivered. [img][/img]
Either of these will also take international size cartridges in place of the converter, so you can easily refill on the go.
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