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I'd have to think about it -- my guess is that the angle change from the staggered washers primarily changes stress only in the bar itself and the attachments on the strut bolts. I don't think the arch exerts any outward pressure pushing the towers apart. The bar just is under tension on the top, and compression on the bottom (which reduces its ability to resist movement between the towers -- the bar can more easily flex upwards because it's already 'bent' in that direction). The nut on the lateral (outside) strut tower bolt is being pushed up -- might want tp periodically check/tighten it. The metal there may deform a bit over time, reducing the stress -- I thought about bending the bar prior to installation to get this effect.
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