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On a danny plug I like to drill the hole offset to the center in the front and in the middle in the back. To accomplish that I mark the spot on the front , then place the read center in my live center of my lathe and put the drill bit from the chuck which is in the turning end of the lathe into my offset mark. Now turn on the lathe and drill, then turn plug around and do the opposite. They should meet and line up , if they don't reach I just finish up with a handheld drill with a long enough bit of the same diameter.
If you don't drill them on a lathe then it's very hard to get consistant results unless you do it on a drill press the same way.
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