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Re thinking what I said about doing this by hand without a drill press or mill, it can be done. Re reading what Bruce Andersons book, Porsche 911 Performance Handbook had to say on this subject you can do it. You must also use the block I mentioned for tapping to drill with. A second hole in the block, slightly larger than the drill, drilled on a mill so it is truely square, can be used a guide for the hand drill. Some skill is needed for this operation ( that means you have done a number of things exactly like this). Not recommended, but quite possible.
Bottom line, ANYONE who is familiar with the most basic tennants of machine work can successfully do this task. DO NOT LIE TO YOURSELF about your ability though, you really do need to have had the basics to do this.
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