Since getting going with my fountain pen addiction I've bought various pens(Ahab, TWSBI Mini, Kawecos & vintage etc), most are used to draw and I've tried lots of nib types and use different pens/nibs depending on how I feel. My ideal nib has flex as it allows line variation and greater expression in my drawings, as yet no pen met my needs, a couple of vintage pen came close though.
My latest acquisition was a Platinum #3776 Century with an SF nib, at best the nib is semi flex but it's a nice pen with a nice nib and great to draw with. After using the #3776 I started thinking about flex again, a while ago I tried fitting the FPR flex nib to my TWSBI Mini with some success, sadly the feed couldn't keep up with the nib so I scrapped the idea.
I recently bought an ICE Sport with a BB nib which puts down lovely thick, wet lines but it's not a flex nib, so I wondered if the feed would cope with a flex nib. I dug out the FPR nib again to see if maybe it would fit the Kaweco feed..it didn't but with a little tweaking it might
After 15-20 minutes with a small file I took 3-5mm off the back of the nib, the FPR nib is slightly square and the Kaweco is round so I had to bend the FPR nib to make it sit snugly on the feed, fitting to the section is a tad tighter but not too bad. Initially the pen wouldn't write but after trying a couple of inks I got it to write a little. Some more tweaking and pushing the nib & feed further into the section and I was amazed at the results. The pen lays a VERY wet line and doesn't miss a beat unless I move fast while fully flexing, the picture shows just how much line variation I can get
Behold the pen itself, I might change the white section to the ICE orange one once I'm happy that the flex nib is working ok.
I've still got to fine tune the tines with my loupe to smooth out the nib but that'll only take a couple of minutes, for around 30 minutes of tinkering I'm now the proud owner of a new Kaweco flex pen There's no reason why the nib and feed can't be fit into my other Kaweco pens so I'll probably try it in my AL Raw which would be my ideal pen.
The FPR flex nibs are really cheap and with a dremmel the modification would take seconds to do, so any Kaweco pen and flex lovers get going
Edited by andymcc, 09 August 2013 - 13:44.