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So would you suggest I just give it another go with the M8 x 1.25 from the back side as dron suggested?
Yes. Get the tap started in the good threads, and that should hold it once it starts cutting the damaged area. If you can get the work piece onto your mill/drill table, use a tap follower to keep it aligned.
Cheers.
So would you suggest I just give it another go with the M8 x 1.25 from the back side as dron suggested?
It should feel more or less like screwing a normal screw to start with, right?
Are there any tips for making sure that I start correctly?