bench grinder problems HELP!!!

just bought a new 6" grinder off craigslist still in the sealed box (ryobi) Not the greatest tool but good enuff for what i need anyways it came with 2 stone wheels and i purrs like a kitten my problem is i replaced the stone wheels for 2 wire whells and the thing does the river dance all over the shop.does anyone have an idea what to do to stop the dancing? i tried different combos of wheels and mounting nothing seems to work.
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