Well I just turned a click pen that I bought at Woodcraft, my first one. I used a resin blank that was green and pruple. One of the barrels has an area where you can see the brass tube. I didn't sand through the resin, it's like the resin is clear so that you can see the tube or the resin is so thin that your able to see through the color of the resin. The pen fit is great,the barrels aren't to thin. Could someone explain what might be going on. Should I have colored the tubes? Thanks, Les.