I've been making pens lately, and up to now, no real problems. The last three blanks I tried to square up the blank ends with the brass tubes, the tubes come back out of the blanks. I'm using a barrel trimming kit from PSI. The first blank this happened to me on, I glued the tube in with medium CA super glue. The next two, I used 5 minute epoxy. Both times, I let the items set for several hours before trying to square things up. I have a couple of theories. 1. I am trying to use stabilized maple burl blanks from PSI. Is it possible that the hardened maple blanks are drilling too smooth to grab the glue or epoxy? The pens I have made up to now have been with regular hardwood blanks, not stabilized or anything like that, and I haven't had these problems. 2. As per instructions, I am roughing up the outside of the brass tubes with some sandpaper. Maybe I am too aggressive with the sandpaper and taking too much off the tubes. Any thoughts?