I can take a picture of the hole tomorrow, but I doubt it will show much. The threads don't look that bad. I have access to about anything I can get my hands on. When I rebuilt Allison automatic transmissions 15 years ago, we fixed hydraulic fitting threads with a Time insert if I remember right - using a heli-coil would let fluid past.

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Brad
1981 300TD - daily driver
1963 Chevy II
2001 F-250 7.3 Power Stroke