Anyone have issues with their 540's cracking. At first it was the part that holds the nib in place (transparent plastic piece where you hold the pen) I called TWSBI and they sent me 2 more replacements. Then I noticed that the inside of the cap where the treads are now has cracks, Ive even seen like pieces come off. Again I contacted them and they sent me a replacement cap. All for free. I notice that the threads on the pen where the cap screws in is becoming damaged. I'm pretty careful with my things, I haven't dropped the pen or anything like that. I use it on a daily basis along with my Noodlers ahab ( I really love that pen) Let me know what you guys think? PS I really want that 700vac but I first have to make sure that the materials dont start cracking.