i need a small part for my Moulinex La Grand Machine?

My La Grande machine model 517 (30 yrs old) would still work great if I could just get the plastic screw replacement that goes on top of the blades to hold them in place while processing. I see these posts are from 2007 so it would be a surprise if I get a reply. But, nothing ventured, nothing gained.
R Flynn, November 2016
Why not contact Moulinex?

XXX, November 2016