Thanks Olin,
It's the tools/DRC/restring specifications. There is a situation when
changing the drill diameters in brd are very important, assuming you plan
production and first time you need to create a homebrew pcb and then
production. This means you need two different libraries, because for
homebrew board the drill diameter it's really small and used just for
drill steerage but for production the drill must be the real one.

On Tue, 19 Nov 2002, Olin Lathrop wrote:

> > I'm interested if some of you have used the Eagle 4.0 or upwards with
> > succes with drill diameter changing  directly in brd. Restring
> > options does not satisfied me, and it seems that drill diameters
> changing are allowed
> > only in libraries.
>
> I've always set the drill diameter and pad diameters in the package
> definition.  However, I vaguely remember there is a setting you can use in
> the package so that some of the particulars are overridden by the design
> rules.  I remember thinking this was dangerous and always specified
> everything in the package, then forgot about it.
>
> After all, the package definition is a reflection of the mechanical
> details of a part.  A specific part will have leads with specific
> diameters which need to be taken into account whether the design rule
> preferences like it or not.
>
>
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