Oblique nib holder for Copperplate calligraphy

Oblique pen modified for big nibs, like Nikko G.
Made it more anatomic and with universal nib holder, don't know how much it's going to last, but worked ok for a couple of nibs profiles...
Needs some supports on nib holder round end, but works good.

Edit: for the ferrogalic ink I used:
1gr tanic acid -you can try some heavy cofee or tea
3gr iron sulphate -garden stuff
300ml water -use less if you are usin cofee or tea