A hammer. Suggests that workers in the dockyard are heavy handed and use brute force and wrong tools to achieve desired outcome, regardless of collateral damage caused.
"Pass me that dockyard spanner, would you, old fruit? I need to jolly well tap this nail in."
To work as a mechanic or mechanics apprentice. Not to be confused with the useless fuckwits in admin who like to use the saying to describe writing with a pen.
AskBob to fix your car, he can swing a spanner properly