Don't worry, you didn't hurt the cartridge. How do I know? I really don't know, but you said the cartridge sounds great. If it were significantly damaged, its sound would betray a problem. It is possible that the cartridge is slightly out of whack, but careful setup can usually compensate. The only absolute way to know is to send the item back to the manufacturer, but if it sounds great now, I'd recommend waiting until you need a re-tip. BTW, the WTT is a very good product and responds very well to upgrades (black platter, carbon fiber tonearm, etc.). Enjoy!