I have one of these culprits, and I do see slight interference.
I have a screenshot from a post by Jens with a picture of his fix and where he mentions a 330μH coil and a 330μF electrolytic capacitor.
I have been unable to find further instructions, so I was wondering if some more detailed instructions are available (in German is OK).
Links to examples of the exact components.
i.e full specs for the type of coil and the capacitor.
I don't mind doing the mod (at my own risk, I know) and I have the tools, but I'm not too familiar with the components.
From the picture it seems you add the coil to the 5V rail and the capacitor between 5V and ground. Not too hard.