[quote=benedict]You can also pick up shaft collars in fractional and metric sizes from most bearing suppliers. (My guess is that's what those drill stops are.)
Another tool that might be nice for this is a Dremel tool with a router base. Set the base so only 3mm of drill is protruding below the base, and you should be able to zap the holes out without any chance of a drill-through.
Tom[/quote]
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