Model M case screws

[Jules Richardson via cctalk]

Can anyone tell me the size of the Model M keyboard case screws? The one I 
use on my main 'modern' PC could use a good clean, but the case recesses 
are a little too narrow for a typical socket to fit - I either need a nut 
driver, or to shave a little material off the outside of a socket to narrow 
it some.

Google suggests that they might be 7/32", but I'm not sure; that's less of 
a common size (vs. 3/16" or 1/4", say) - I'm not even sure I could find a 
driver like that around here.

cheers

Jules