>>1995525>>1995533Dude wait don't strip the thing or your fucked. I suppose you bought a chinese thingy all in one.
Instead buy one like picrel where you can fit both a wrench or 1/2 inch thingy, then you get the longest lever you can apply, be sure to engage the tool well by pushing it thight on the nut, and It should go. YOu can get an ice toolz for 15 euro on amazon, or you can get a chinese one for 5-10 euro, as long as it is for a wrench.
Then once you get it out, I suggest buying an inner centerlock ring, it works better and it uses a normal cassette tool