wish I could remember, it was pretty random. I used to just tune the banjo somewhere randomly within the key of the songs and write the parts back then. All I can say is that there are definitely a lot of open strings within that riff....I can tell that the first and last notes were open string...anything involving a hammer-on as well....that might point you in the right direction of the tuning. That's how I'd try to figure it out again haha
This video is amazing!! I always love claymation (I've made some myself, so I'm even more in awe of the patience you needed to creat so much detail!), but besides being gorgeous, this has an adorable story AND a crazy UPS man! How awesome can a video get??!