Thanks to everyone that contributed to the thread (pun intended, hah) this far.
I have not been able to recognize the thread gauge, but with the help of some guts, a loupe and a japanese needle file set that I bought almost thirty years ago, I have been able to clean up the damage. It goes in easily now and I am set to put it all back together. This "project Norma" has been quite the learning experience.
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