My Mac Daddy broke a few weeks ago and I found myself a couple of taperd blades today, Had to cut about 10 inches up the shaft to stick a blade in. there was this spine like thing inside the shaft that was causeing my some issues, any way im gonna throw an extension inside the other end and see how it works after all this. Later this summer I may have access to some broken 10K OPS. Is there a certain AT number that is easier to turn into a taperd shaft or are all 10K's the same. thanks