My fountain pen ink cartridge won't puncture?
I got this calligraphy starter set the other day, and I was really excited to start using it. The manual that came with it had absolutely no instructions on how to set up the pen, so I tried to figure it out on my own. I'm pretty sure I was doing it right. I even looked up how to insert the cartridge, and I was indeed doing it correctly. But no matter how hard I try, even putting my whole strength into it, the cartridge just won't puncture.
Am I doing something wrong? Or am I just too weak? Please let me know in the comments! :) Have a wonderful day. <3