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Do not be afraid of using a die grinder and coarse carbide bit to shape magnesium parts. I've wielded them up and reshape parts without any issues. I would just cover the case to only expose the area you are working on. Just like open heart surgery. This will prevent any bits from getting in to the oil passages.
Take your time and use machinist bluing to help keep focused on the material you want to remove. spin the bit fast enough to eliminate tool chatter. You do not need to much force or tool speed. Let the tool do the work!
Save your money for somthig else like 3.6 piston squirters
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