Wiper mechanism problem

[leylandracer]

Just wondering if its a common problem for the ball joint on the wiper mechanism to part. Its a very slack joint which easy pulls apart :-( The 1st time I noticed this was on a run out last year when the wipers decided they wanted a fight with each other :-( fortunately no damage done.
Not my car in the pic, but the offending joint is the one nearest the washer bottle, Any fixes for this? or is it a new arm/rod required....
Thanks.