Still haven't found anything that tells me what was meant by black "grasshopper" fin...
What I was referring to was black being the hardest finish to do & how Dr Bassman has progressed to be able to snatch the pebble from Master's hand (Kung Fu TV show). Carridine's Master called him Grasshopper. When Grasshopper could snatch the pebble from masters hand it was time to horribly burn his arms by carrying a hot searing kettle into the snow & then leave.
Dr Bassman is much like Kung Fu, except the kinky sex in the closet part (that I am aware of )
Dr Bassman started out as a Grasshopper but now is a master craftsman.