I've noticed that when I do a regular post smoke swab of the moisture trap and smoke hole of my Peterson System pipes small burrs left over from the drilling seem to always pick up a bit of lint or fuzz from the pipe cleaner or cotton swab. I know this is not a big deal but little things like this bother me. While my Pete's are finished nicely on the outside they are factory pipes after all and I wouldn't expect them to be polished to the extreme on the inside.
The other day this fuzz problem got the better of me and I headed out to my workbench to find a solution. In my sandpaper collection I keep several grades with double sided tape laminated to the back of the paper so I can attach it to sanding blocks or dowels depending on the sanding task at hand.
I cut a small piece of 220 grit just big enough to wrap securely around the handle end of a chainsaw file. The diameter of the steel rod along with the sandpaper fits just right into the smoke hole. A quick spin and a couple swipes around the moisture reservoir was all it took to smooth out the rough edges and my cleaners come out dirty but leaving no fuzz behind.
I now do this simple procedure when I first get a new System pipe and I have gone back and hit my older ones. I know it may be a non-issue to most but I'm particular about some things. Heck I still fold my T-shirts into perfect squares like I was taught in basic training over 20 years ago.