Do you know what Pilot Parallel Pen famous for? For the constant ink flow supply. This is highly convenient for calligraphers. Especially when you write on a regular office paper sheet. Ink do not run out, lines are fully filled. And you don’t worry about losing your line on the hairpin turn. It is extremely useful in sketch-preparing step, while practicing or making quick outlines..
All Pilot Pens are available with 90 degrees feather. As for classical Arabic calligraphy standard is 45 degrees. So you can take in hand qalam (markers are too “unnatural”) and use a smooth, prepared paper or.. to modify the Pilot Pen. This is what I suggest you to do.
For modifying my pen I used a grinding circle. Gently, slowly turning the pilot nib. Do this when there is no ink, otherwise you run the risk to splash yourself. Another important thing – don’t forget to clean up the area between the two plates (nib). After a rough, initial process something will probably clog the nib.
Remove the main part of the metal, try to write down with it. Most likely the pilot will behave “rudely”, clinging the paper and skipping the line. Don’t worry. After the treatment you will still have the bumps. Fix them by using the same grinding stone.. Carefully grind the newborn Pilot Pen. Write something and watch which side need to trim.
Bonus I suggest you to watch the video how guys did the same thing using a dremel (as for me as it is more complicated) .
The main thing: do not be afraid to spoil the pilot. Better to concentrate on the process and take your time. Gradually remove layer after layer. If you fail to do 45 degrees nib, you may discover something more interesting. Moreover even with 90 degrees pen it is possible to write Arabic calligraphy.
I wish you a successful process and beautiful lines!