I've got to put an oil drain in my PSRU.   I can put a 1/8" hole in, and have it route around the ring gear; but I don't think 1/8" is large enough.  I started trying to put a 1/4" hole through the ring gear, but it seems to be harder than the bits I have.

How does one put a hole in the hardened steel, or is 1/8" large enough.

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