[Robert A Cook PE]

She needs a metric hammer.

But she'll have to get it adjusted with an FAA-approved calibrated left-hand metric crescent wrench hammer first.

[buffaloguy]

In the years (1970s) when the government was pushing metrification there were weekly ads in Parade, a Sunday newspaper supplement magazine, for metric hammers. About twice the cost of a regular hammer. It was not Ron Popeil selling them!

[SunkenCiv]

;^)