Good point,altough I've seen so many people burn the bushes out on Saxos and not and never heard of any such problems,it would take some serious forces or collision to snap cast iron of that thickness considering they are designed to bend and not snap,even for them to bend I really wouldn't see how they would do that with normal or even track-day use.
There's is also the possibility to weld a strengthening plate on the wishbones if worried about that,and on that subject,wouldn't the heat from the welding reach over 150° degrees anyway?
Note: I'm talking about original wishbones from the factory not aftermarket ones that in some cases I have seen have a reduced thickness.
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