Here is a Pen Blank Sizing & Cutting Jig from PSI Woodworking Products. The Jig is designed to allow you to cut a pen blank to exactly match the length of your pen tube. Once set up, you will never have to re-position the jig regardless of any changes to the length or diameter of your pen tubes and blanks. I am listing a number of items this week, and I will combine shipping on multiple orders. Wait for a combined bill from me.