Jim Thompson scrobe on the papyrus:

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..
..
Up one drill size plus cutting oil did the trick. All 24 holes now
tapped ;-)

...Jim Thompson

I don't know if you can get these on your side of the pond, but I used
to get through tens of thousands of them every year.

http://www.avdel-global.com/en/produ...hin-sheet-nuts
ert.html

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If you're too open minded your brains will fall out.