"Jim Carriere" wrote in message
...

Last random thought, I wonder what they do in parts of the world that have
left the dark ages and embraced metric

}:-)
that's the easy part:
-) if it's just a plain hole, find the proper length & diameter & fit
-) it it's threaded and needs to be,
run the next larger reamer (?) in metric, then proceed as above

for those unawa metric screws, bolts &C only have a diameter and a length
M4*40 means it is 40 mm long and will pass a 4mm hole,
now isn't that all there is to say?