watchmaker‭

Mark Twain, My Watch:

While I waited and looked on I presently recognized in this watchmaker an old acquaintance -- a steamboat engineer of other days, and not a good engineer, either. He examined all the parts carefully, just as the other watch-makers had done, and then delivered his verdict with the same confidence of manner.

He said:

She makes too much steam -- you want to hang the monkey-wrench on the safety-valve!