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How fast are you spinning the drill bit? should be slow approx 300rpm with lots of pressure and sharp bit. If you have a industrial supplier near you can pick up a small solid carbide drill bit, that will get through but they are very brittle, and you don't want to break one of those in there.
Once you get a hole in, there are easy outs that are fluted they work quite well, some heat to release the lock-tite.
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87 930,
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