Buggy please read first (Welling DA16)

I have a buggy that is perfect apart from one of the front wheels keeps falling off. I think there is a problem with the locking bit. I brought it from someone who never told me about the wheel problem.
If someone is good at fixing things and would like to try I'd be very happy as the buggy is like new otherwise and it seems such a waste to take it to the top.
Can send pics if wanted.

Collection from Welling DA16 near to Crook Log Leisure Centre ☺️

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