I think I'm wearing it down

Well, I continue to remove metal from the drive shaft bolt in the beetle, but it still won't budge.

Here's the bolt as I started this evening:

I tried to grind a deeper slot in the bolt for a screwdriver, and grind some of the washer that the head sits on away:

And last I spent some time trying to grind away the pressure pad under the bolt head:

Nothing so far, it still won't budge.

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