I am an avid pool player and one of the first things I searched for when I joined the site a few weeks ago was a pool cue pen. Several posts on it if you haven't seen them.
If the guys here do custom laser designs you could probably get one exactly like the butt of the stick your friend uses. Basically replicating his wrap, after wrap, points, and inlays on the butt. With the cap, use a flat capped pen and glue a pool tip to it so when cap is on it looks like a little mini stick.
Another idea along the same line is to make the pen and take it to a local cue repair person and have them actually wrap the pen matching the wrap of your friends cue. This would add texture to the pen.
Couple years ago I placed 3rd in the nation with APA for my skill group. I would loooove to make a pen designed on the butt of that stick and put it in my stick case for record keeping when I play league.
If your friend is like me he is going to LOVE any thing you make him even remotely associated with pool.
The ferrule is not the joint. The ferrule is the ivory piece or simulated ivory piece that is at the end of the shaft that holds the tip. I know this because I have shattered and cracked a few breaking the rack :biggrin:
The joint of a stick is where the shaft collar and butt collar join together.