You are referring to the main cutter clutch. Sadly there are absolutely no parts available for the Model 40 at all. All you can do is try to make something up yourself or find another model 40 that's in a state of disrepair and only good for salvaging parts from.
Cheers, BB
I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.
