As I don't have a 3mm reamer (my nearest being a very odd 3.3mm) I made a new D-bit to ensure a nice accurate hole... there's something very satisfying about making these simple tools and getting a good final hole just as there is when grinding HSS tools for the lathe and getting a good finish. Or maybe it's just me! I took care to get the hardening and tempering right on this D-bit too, some of my previous attempts have got a little chewed up after 3 or 4 uses so obviously weren't properly hardened.
As the first picture is pretty boring, here's another version spiced up with some fine ales to look at instead :D
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