Ok , I have been informed of the Works of The Brass Nut ,
Wind back the Brass Nut as Far as it will go ,to reveal inner shaft , obtain Hessian String , Feed the String turning the shaft as ' you ' go onto the shaft with grease , when the desired amount of String Packing is reached , Close the Brass Nut , to compress the Matrix . Up against the Flat Belt Sheave . I suppose it is called a Gland Nut .