User blog comment:SpaceManiac888/Rusty Spanner of the Episode: Series 10, Heat 5/@comment-1770349-20171126215949/@comment-4700688-20171126230545

I think it would be unreasonable to ask even the world's best welder to put together an axe that thin which would withstand repeatedly smashing it into a 2500rpm 20kg spinner with a hole in the middle which would only help it tear up anything that came in the middle. You don't stick your arm in the centre of a fan and expect to come out OK, I thought Shunt impressed to stay undamaged for that long.