Nope, you don't have the wrong prop. You just need to enlarge the hole on the prop. Yes, you can drill the hole out but I wouldn't recommend it. It's easy to get the hole off center which will throw you prop out of balance. If you can try using a prop reamer to enlarge the hole. Just remember that the reamer only cuts in one direction, so don't turn it backwards. You can find them at Tower hobbies with this link [link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXK248&P=7[/link]

Hope this helps

Ken