1. Noodler's fountain pens. These are 'Hacker-friendly' pens. With most pens the nib and feed are glued in, but in the Noodlers pens they are push fit, so can be adjusted. You can adjust the amount of flex and flow independently. You can also take out the entire filling mechanism, and use the whole pen body as a reservoir. Neat. http://www.fountainpennetwork.com/forum/topic/209380-noodler... 2. Vim It was a bold desi…
Re 1. Almost all fountain pens are "hacker friendly". I have a couple of pens which are much more expensive than Noodler's and I have completely dismantled and then reassembled them multiple times while cleaning. Unless you are using some proprietary filling mechanism, both the nib, and feed are interchangeable.
The Noodler's also have the feed made of cutable ebonite instead of cheaper plastic, so you can carve out a deeper ink channel if you want.