Heads up because I didn't know this until today. If you order the Pen Tool from Pazzles, ask them to also send you a metal screw with it. The one that comes with it is plastic and strips easily. Unfortunately, I have to go to a hardware store to see if I can find a metric screw to fit inside so I don't have to wait for it in the mail.
I didn't order mine from Pazzles, but I ordered it from Amazon. I didn't even know a metal screw was available before I bought it, so this is why I am telling you all before you buy one.
Good Luck. :-)