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It seems like the threads are flattened where the holes are for the cotter pins (hard to see in the picture). I'll ask my friend if he can bring a die next weekend.
There's a Harbor Freight tools where you live. Pick up an SAE tap and die set (they are usually like $35). You'll use it a zillion times anyway. Then you can get more work done. You'll probably want to take the joint off the arm (hit what it goes through method, or a puller) to chase the threads. Everything will be fine.
'70 Duster 470hp 340/T56 Magnum/8 3/4 3.23 Sure-Grip
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