Hey I have been trying this for a while no but to no avail. I am new to this forum so sorry if this has been posted before but is it possible to take some of those highlighters that have a white casing with silver numbers/letters on them ( will add a pic of the highlighter at the bottom of post ) and turn it into a marker that uses ink instead of that fiber-ish looking stuff that is in the plastic tube? Would I have to modify the nib or something? Any help would be appreciated.