I tried to repair aperture blades on a shutter with a similar problem, I didn't find a way to get the metal stub to stick in the blade. I remember trying a dab of thread locker, that didn't work and I didn't have anything else that felt worth trying. That was a 20s or 30s dial set shutter. On the other hand, I did manage to replace a set of blades in another dial set shutter, the blades were intact but a couple had jumped out of place somehow (heavy impact at some point, possibly). It took me a good couple of hours to get the blades back in, the first 17 or 18 blades are simple enough, the 19th was a nuisance but getting the final blade in place was tough. A few times during that process I wondered if there's a secret knack to replacing the blades, I suppose the answer is lots of practice and small fingers.
Before anyone points out I shouldn't have bothered; I received both lenses in that condition - and a professional repair would have cost more than a replacement lens. I hope Randy can fix that lens, I'll be interested to hear if there are any tips about getting the stub to stick in place in an aperture blade.
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