need help with crank/timing sprocket/ pulley

[MiltonHavoc]

So my crank bolt backed itself out. I went to fix and found the square key was mauled.

On the big crank festivas is there a piece that goes between the pulley and the crank sprocket? Or does the pully just screw in with the crank bolt?

I know on the smaller ones there is a lip that the pulley sits on. My sprocket doesn't have that lip.