Works absolutely fine in my Ohto F-Spirit, my only objection is that it's very
hard to rinse all of the ink out of the converter (some ink somehow gets stuck
past the black part and you just can't get it out). I've solved this myself by
just having separate converters for different inks, so there's no mixing. At
$1.50 per converter that's do-able, especially since the converters work fine in
my non-Ohto pens that take international cartridges, and I can use my green
converter in any of my pens as long as I'm using green ink.
Great price and a sturdy little thing.
It's so fun getting to put new colors in my pen.
It fits in alot of different pens too. I got it for my Rotring Core and it made
me so happy to know it fit.
It's also nice that the plastic is super sturdy and even if it did break it's
super cheap to replace, horrah!
I bought this in conjunction with an Ohto Dude fountain pen and RIGHT out of the
box it worked perfectly.
This is the very first converter I've used in a fountain pen and I found it to
be very easy to use. I had absolutely no issues with filling it and I have come
across no problems after using it so far for several days.
Highly recommended for specific Ohto products!
(Several other Ohto pens will not accept converters, so some research is in
order if you are looking to buy!)