I have recently bought a Lamy Safari 17 matte black fine nib fountain pen. I just love it.I want to know two things. 1. Which one is better for long run use, the T10 cartridge or the Z24 converter? 2. How is the durability of the T10 cartridges? I have a syringe and I wish to reuse the cartridge filling it with bottle ink after the lamy ink inside it runs out.