Third year apprentice (one of the best we have had) was having trouble putting the meter tails into the mains isolator on some new builds.
He was having difficulty tightening up the hex screws.
One answer in the office was "You have a shit set of Allen keys"
In his defence he replied "They are brand new I only got them on Saturday and I paid for the most expensive of the two pairs available as I don't want shit tools"
Anyone care to guess what went wrong:-)?