<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">wagonmaster2 </div></BLOCKQUOTE>
I got it at a fabric store. There is one I believe is a national chain - JoAnns - that carries it. I would think others would also have it.
I tried to do it the "easy" way the first time and it was actually much harder than taking the whole thing apart. By taking it apart you can also remove the metal burrs on the inside that cause the string to wear out. At least that's what was happening with mine. In any case it's really pretty easy to take it apart. The pieces just slide out after you untie the cords from the little plastic spools.
The restringing diagram for mine is below.
<img src="http://www.irv2.com/attachments/photobucket/img_259315_0_d316e39953089b7f529deb9a585551be.jpg" alt="Image hosted by Photobucket.com">