[sdiy] Mounting hole size for switch - can't seem to get from datasheet

[Aaron Lanterman]

My mechanical datasheet fu is not strong. I have a doctorate in EE,  
which automatically means I have to suck at practical stuff. ;)

I'm looking at these MS550x series switches from Mouser (well,  
actually I'm looking at the cheaper Small Bear versions, but anyway...)

The datasheet is here:

http://www.mouser.com/catalog/specsheets/MS-200272.pdf

The mouser page is here:

http://www.mouser.com/catalog/catalogUSD/638/1632.pdf

I can't alas seem to find the magic number that tells me what size  
hole to drill to fit such switches. Can anyone see the magic number or  
tell me how to get it from the available measurements?

If I had a switch on hand I'd measure it - I'm just working on a file  
in FPD, and would like to know what measurement to put in.

Thanks!

- Aaron