BLP Piano Shop Training - Installing Trichord Dampers

[@saveriosalerno9232]

A good school that of Brigham Larson..complimeti

[@jumpinjackfishback88]

I recently acquired my 1887 J&C Fischer upright. It has double unisons instead of the normal three. How do I go about replacing dampers? Would I use normal flat dampers or like the double string bass dampers?