I was in the process of checking the valve clearance. I went to remove the Crankshaft end cap; the one that allows you to rotate the engine. I notice the insert area was a bit chewed up from a previous owner. A 10mm Allen wrench fits into the end cap. I am unable to budge it and have rounded off the edges. I put penetrating oil on it. I tapped it to create an impact effect. Anyway, what are my options?
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