I don't remember the size but this is not M6. I was about ready to run a tap through it before I tried a different imperial bolt. I will get back to you with the size. Who knows, maybe I have a weird wiper motor.
I took the best picture I could. This bolt is an M6x1.00. It is not going in. The tap I have is the same size and starts out all tweaked. I tried all the common sizes for American and Metric with some help at Ace. If I drill these threads out for bigger threads I fear that I will drill out the shoulder on the bottom. I fear that if I force the tap through I will make my problem worse. What do I do?
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