It’s my first pen with a converter + blind cap so it’s a bit strange 
When I fill cc pens I always hold the converter & section firmly not to have the converter loose. When operating the cc by removing the blind cap the barrel keeps the converter steady. The turning knob of the converter is polished steel but it can be operated easily. On the other hand you do not see how much ink you manage to suck up.
I’m going to meat @dragorsi Wed 27 Feb afternoon, it would be great if you could join us. I’ll bring my Leonardo too
I’ll try to do a review of all the Akkerman inks I have. They behave well, I’m quite satisfied with them in general. All of them are custom made for Akkerman by Diamine as far as I know. The bottles look great and are very practical, their price/ml ratio is good, you get a lot of ink for a reasonable price. I’m no ink expert but will try to do some comprehensive review