Just in theory of course. No one could possibly be this stupid.
If some one somehow managed to drop all the shutter blades out while dismanteling an old enlarger lens in order to replace the lens elements with some other ones. Just becuse the threads would fit and the new elements needed something to hold them together so this theoretical person could see if his new (old) Zeiss Tessar could be used for anything fun.
Would there be any humanly possible way of putting the shutter blades back again?
Just asking out of curiosity.