The photo is out of focus but it looks okay. Find a fine single-cut 60° triangular file and chase the damaged area until it looks clear and your new coupler threads on with ease.
I'd use a file and get it over with (preposition at the end- is that legal? ). However, should the op have poor eyesight, he might consider the above mentioned metric thread file. Here are some pics, now you know the thread pitch:
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