lol
bad luck, did you pin point the problem so it doesn't to the next one ?
or just get a thermo fan/ or twin if all else fails,may as well go 52mm with a metal ( alloy/ galvanized) shroud knocked up
note: i've had a rad's fins/tubes fixed before from thermo fan damage, about $80, but if its a ebay china spec may as well get another one considering how cheap they are