I bought a lens and this is what I received :-(

[paul_c5x4]

I am tempted to scan the broken shutter blade and import the outline into a graphics editor to fix the broken outline, then into a CAD editor to make a 3D file.

Having done just that with an aperture blade, I was less than impressed with the scan and resulting CAM file. I'm rigging up a camera on the mill and will use it to pick up key points around the blade and then feed the numbers in to my CAD/CAM program - The material will be brass shim stock which will then be soaked in either KSRT or cuprammonium carbonate solution after machining.

Since the pair of acceleration/deceleration times for the blades from a standing start upon each shutter release cycle would be dependent on their mass (overcoming inertia), I would think any replacement blade would need to be a match, so as not to be out of sync with the other blades as they all started and stopped twice each cycle?

But the shutter blades are all mechanically linked together, so a slight imbalance of mass shouldn't make any difference. A fractional change in total mass may affect the opening & closing times, but will this be noticeable on (for example) 1/25 Sec ?