I have one of these on my gas Wacker for over a decade...you simply insert 6 inches of line thru two holes....love it. If like to get my dad something similar but it needs to be for an electric black and Decker model. If also consider getting him a battery operated model f it were light enough and could accommodate the rapid load thing. The battery model needs to last an hour..it takes him that.long to edge and wack. He is older and not open to gas stuff. The rapid load fitting is a must.