I’ve been trying to find time to work on a melodic (banjo) three finger style version of Midnight on the Water and watched this old time fiddler Benny Thomasson.'s version looking for ideas. I thought, “Is that a young Ricky Skaggs playing the guitar?” Turns out it isn’t but the bass player is Markie Shubb.
https://www.youtube.com/watch?v=aWgzcd5JXzc
Turns out Markie Shubb was married to Rick Shubb, who invented the Shubb capo. The description of how that came about is a veritable who’s who of the Northern California bluegrass scene. Anyway, that’s where the Shubb’s capos came from.