According to the internet source, "the lower part of the binding"; It is the part that is inserted into the Tenon of a chanter; NB: Note the incorrect and therefore misleading term "hemped seat", used in the internet source; In this context "hemp" is a noun (i.e. the name of a plant that is the source of the fibres used for this purpose); The correct spelling of the adjective of this noun is hempen; "Hemped" is the past participle of the verb "to hemp", which is exclusively related to (the prescription or administering of) drugs!