Harry Sheridan was killed in December last year when an excavator bucket fell on him.
He was a carpenter working at the West Ham station of the Docklands Light Raillway, which is being extended for the Olympics.
The bucket fell from a semi-automatic hitch on the excavator – a problem that has killed at least ten construction workers across the country in recent years.
The Health and Safety Executive (HSE) and manufacturers have agreed that no more semi-automatic hitches will be made. But nothing has been done about the thousands that are still being used every day.
Skanska has said it will no longer use quick hitches from November.
But the HSE has still not banned their use on sites. Why are so many quick hitches allowed on the Olympics site?