Gearbox cover stud nut, Norton (set 3) laydown

Gear box cover stud nut and washer [not included] (set of 3), ZP.  Suits Norton dolls head, upright and laydown gearboxes 1934 to 1956.  Dolls head requires 7; upright requires 1, laydown requires 3.  Norton used a spring washer under the nut, one of the few places they had spring washers, but it does chew up the aluminium.
Original part numbers:
3596; A2/307; N8267 - Gearbox cover stud nut
9663; A2/308 - Gearbox cover stud nut spring washer