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@bq
You can get a stepped drill bit which increases by 1mm every so often. This is used for making existing holes larger. like this:
http://www.tooled-up.com/Product.asp?PID=109092
Or plain taper bits if you're confident.
http://www.tooled-up.com/Product.asp?PID=3798
The trick is to put some tape or tippex on the bit at the depth you need to stop drilling.
Not sure what bit you use for the flat-faced countersink though.