Image above via Richard Binder's nib smoothing guide
Now that I knew the name of the problem, I found an abundance of tips and advice on how to fix the issue. Perfect.
I'd watched this video a couple of times about how to smooth a nib, but it doesn't cover baby's bottom. It's still an excellent video and very instructional for making scratchy pens smooth.
After a quick search, I landed on this tutorial by Stephen Brown on how to get rid of baby's bottom on a nib. Absolutely fantastic. The video is about 14 minutes long, in which Stephen demonstrates the technique on a Mont Blanc.
As always, it's extremely important to note that working on your pen is something you choose to do completely at your own risk. Any damage or voiding of warranties is entirely your fault. If you don't want to risk it, send your pen to a professional.
So, what do you need in order to smooth out that baby's bottom? A few things.
First, you need micro-mesh pads. These are similar to sandpaper, but they're soft and attached to foam. This makes it more difficult to cause too much grinding. Anderson Pens sells a great package of 9 different pads for smoothing and polishing. This is a great package because you need these varying levels of grit in order to properly correct the nib.
I used a nail file that I found at the local store. It has four sides of varying grit and is foam-backed on all sides. It's not the best, but it works well. I plan on purchasing a pack of pads from Anderson Pens with my next order.
Next, you need a small amount of water. I kept mine in a syringe.
It's also handy to have a rag nearby to clean up the water and ink from the pads.
And, finally, you need a pen that is troubled by the terrible baby's bottom syndrome. The pen needs to be inked. Otherwise, you won't be able to test the nib and ink flow after each smoothing cycle.