The S shaped blades on my SLX50 XT2 are for the quick attach blades.
Nice idea, but the grass and dirt gets up around the piece you push down to be able to turn the blade. Usually remove the deck scrape the stuff off of the shoulder of the quick attach and smack with a hammer a few times to change the blades. Great concept, not a good idea. Definitely not faster than zipping a bolt out with an impact.
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