A new key will not fix your problem, a new key from ebay will not work without using your old key blade and guts and it won't fix your problem. A new tumbler is not needed. Go back to post 1 and click on "update' and read it - that is what is needed. Do it now or it just gets worse when it won't turn at all. If you can't do it -print it out and take it to a good mechanic and have it done.