[texhax] Redefining default font sizes

[Mike B.]

Hi All,

I'm using a non-standard class file which defines the font to be too small IMO. So I would like to temporarily redefine the default font sizes to something larger to make it easier to proof-read. 

Can someone please advice how to do this? I know it's possible to redefine the \defaultfamily command but what about the default font sizes?.

Thanks,
Mike.