If you try and go in with the 1/4" (I assume if it is like the cartrige I got) it may tend to wobble and over bore the hole. Make sure the bit is a tough one as it will want to snap off if it is a cheap brittle one. I would really suggest a drill press and a good vice or at least a good bolted down vice to keep it from moving. Keeping the drill nice and strait maybe a challenge.
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