Tool:

5″ Sanding Mouse
http://amzn.to/2u6s8ts

As recommended by Nick Offerman:
https://www.youtube.com/watch?v=Gh6H7Md_L2k

Transcript:

It’s time for another Cool Tools review. This time I’ve got a sanding mouse. I picked this up for $10 just last week after seeing Nick Offerman mention them in a This Old House video that I’ll link to. If you want to pick this same one up, using the Amazon link in the video description helps support my videos and the Cool Tools blog.