Custom weights seems to work really nice on springs and suspension parts depending on there geometry ,That's @David Dominguez field so I'm sure he'll get back on it soon as he's working on the final physics adjustments right now.
Thanks to @Ben O'Bro for the tips on how to get the brake lines working without losing my mind, like he did on his wonderful Caterham
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cables and such I did all our RSS2 car using it ,
I even tried the tires but had no luck