Pity most of it gets filed away.
First, I reduce the thickness standing proud of the frame side, so the back of the wheel has a tiny amount of side slop. We don't want it running on the bearing, increasing friction.
Them a reamer is used to open up the hole. I'm sure this sounds odd, but the holes are normally, slightly smaller then the axle diameter. This alloows them to be opened up so the wheels spin freely. An added advantage is that if the bearings aren't perfectly in line, the long broach will line the holes up.
All that brass swarf, it does seem a bit of a waste, but I'll trade that for good running.
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