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Hi the handle on the Dyson animal big ball has come out of its fitting at the front, how do I get it back in as every time I use the handle the bin comes loose.

The dust bin is secured by a spring latch in the handle of the dustbin. Here is a picture with an arrow pointing at the spring:

Make sure this spring is properly seated and hasn’t become loose or lost. Also check for any other damage. If lost, here is a handle assembly for the DC65: https://www.amazon.com/Dyson-966060-01-H…. I’m getting conflicting information if this handle assembly is compatible with the DC75, but maybe you could replace the lost spring.