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Use a fresh cutting disc, and use high RPM, like 15000.

Start at the edge with the disc spinning awat from the edge (you don't want to hit into the edge), and you will get through it before the...

If you have a Dremel, then cutting off part of the blade and giving it a new point would not be overly hard. It's only a 10-15 minute job.
If you really think this is beyond your means, then send me...