Husqvarna TC 450 Workshop Manual page 350

"KIT" ASSEMBLING INSTRUCTIONS
Remove the circlip (13), the spacer (12) then fasten the plate (6) in the holes (A)
on the R.H. crankcase (C) using the two screws (38) M6x14 (+LOCTITE 243).
Assemble the shaft assy. (E) in the seat (B) then place the hook return spring
(37) in the crankcase hole (D).
Assemble idling gear (40), washer (41) and circlip (13).
O.20 Part. N. 8000 H1344 (10-2009)