Routing a slot in a brittle laquered surface

"[email protected]" wrote:
>
> Hello,
> As you can tell by the question, I'm not an experienced woodworker.
> Anyway, I need to elongate an existing slot in a surface with a brittle
> laquered finish, and don't want that finish to splinter or crack. I have
> router bits and drills, and can also get access to metalworking endmills.
> Any suggestions? How do the pros do that?
> Thanks in Advance,
> Jim Mass

I'd use a "down cut" router bit or a "left hand spiral" milling
cutter.
...lew...