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Perhaps we can refine the question: Above what speed can you get away with a grille block? Offhand, I would have thought that an open grille would only be required when crawling through traffic i.e.below 20 km/h. With more-or-less continuous forward motion above that speed a grille block would be OK. Thus, a pretty durned gutless ("No, I'm sorry, we only have pretty gutless and durned gutless, but no pretty durned gutless springs in stock") spring would suffice.
I accept that some folks just like doing things with all them motors and relays and electrowhoozit doodads, too. Me, I like to drill holes in things.
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