They may have been referring to a Whitney punch, for example:

http://shop.store.yahoo.com/toolsplus/rop5jr.html

I get a LOT of use from mine, but there is the restriction that
the piece you are punching must fit within the "throat" of the
punch tool.  Great for flat pieces like front and back panels,
not very useful for 3-d pieces like molded case tops/bottoms.

Brian Aase

> Hi,
> I have been searching with no solution, hopefully someone here has already 
> tackled this.  I have a small Serpac case that I need to drill holes in.  Of 
> course it is nearly impossible to make the holes stay on center from the 
> beginning of the pilot hole until you step up to the final size you actually 
> need.  Then the controls are off center or out of line with each other.  I 
> read on another forum where someone said they used a "self centering hand 
> punch" but I can't find anything suitable.  Has anyone found anything?  This 
> case is plastic so it doesn't need to be too heavy duty.  Thanks for any 
> help.
> FJ

_______________________________________________
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist