V grooves vs square grooves
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The other part about this is that, with consistent use at least, then you will likely end up getting more spin off of fresh conforming grooves rather than older non-conforming grooves. I know this is the case for me, as I had a Vokey wedge from a few years before the groove change and I can't get near the spin from that as I do my current wedges. That being said, it's likely time for me to get new wedges again in the next year or two since I am starting to see little nicks and indents in the face, as well as having tried some of the new wedges. I don't really need the spin itself, but my wedges are starting to give inconsistent spin (sometimes more, sometimes less) depending on how the ball will grab the small scrapes and cuts in the face that came from range balls and sand/dirt.