MSR Windburner 1.0 HELP

[Onasled Overland]

Has anyone ever taken apart the MSR Windburner burner? Mine just shut down on me. It'd done that before, but recovered. This time it remained disabled.
I figured I'd take it apart and clean it. Kept track of all screws and parts, but go figure, one got away from me. I have it, but just cant figure out where it goes.
Help please.
MSR will not return my inquiry.

 

[M Rose]

What got away from you?

 

[Onasled Overland]

What got away from you?

This round disk. Only time I can get a flame is when I place it between the aluminum fuel/air block (in photo) and the burner itself, but the flame is shite. And there is nothing to keep it in place.

 

[M Rose]

I have no idea… I haven’t ever pulled my Windburner that far apart.