If the cheap wrench set was, in fact, decent, it would not have rounded off the bolt.Is this used with a ratchet? there's no clearance to use a rachet with a socket on the pulley that I'm having the issue with. that's why all i had was a cheap/decent wrench from Amazon.
When you get this squared away, time to get a better set.
Stahlwille, Williams, Hazet, Wright, are all available at relatively reasonable prices, and they don’t round off the heads.
Think about the money you “saved” by getting cheap wrenches.
Would you now pay that difference to avoid this rounded bolt and the extra work, not to mention extra time, and potentially, extra tools, that this job is taking?