You will need:
-Lathe with a 7mm mandrel
-7mm drill bit
-Old cloth rag
Making this pen took me about an hour to complete. The longest part is waiting for the super glue to dry.
Next you will need to find the center of the wood block so you can drill a hole.
Draw a line from corner to corner and form an X at the end of the block.
To ensure you get a straight hole in your wood block, use a clamp to hold the wood in place as you drill through the center of the X.
Use a 7mm drill bit and drill all the way through the piece of wood.