Schneider Componon 80mm f4 has a slight rattle?

Just checked mine and it does rattle very slightly, have to hold it near my ear to hear it.
I think it is probably the aperture blades though.
My 50mm is even louder !!!
So Normal ?
C
 
I doubt it will be subject to much movement on the enlarger other than up and down slowly for focussing. I would be more concerned about whether it's sharp or not!
 
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