Hello
AFIK the aluminium trailing arm will not bend, it will break.
Newer arms have an threat and Porsche supplies an screw in Ball to fit them intoi old cars.
It is possible to cut away the old balls and mill an thread in. I did this once and I´m lucky not have to pay for tools and labour. The ball is hard chrom moly and has an special anchore plate put in while casting.
Next time I will have to let them erode out.
First to check are the bearings and if the gland nut is thight.
Grüsse
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