Homelite flywheel woodruff key 

Part #: 75078

New old stock part from closed out dealer.

Fits:  4-20, 5-20, 6-22, 7-21C, 9-23, 9-26, 17, 35SL, 250, 252, 300, 350, 360, 500, 540, 650, 707D, 750, 770D, 775D, 775G, 900, 909, 990, 995, 8800, Buz, C-5, C-51, C-52, C-7,C-71, C-72, C-9, C-91, CS-40, CS-50, CS-4018, CS-5020, Super 650, VI-123, VI-944, VI-955, XL-98A, Super Wiz 55, Super Wiz 66, Super Wiz 80, Wiz 55, XP-1000, XP-1020, XP-1020 Auto, XP-1100, XP-1130