Finally was able to repair the cube. I found another cube at a party store for $0.50 and broke it apart. It was smaller on the outside but the insides of the new one were identical to the insides of this T.B. cube. This was perfect because a little careful work with a file and x-acto knife and the replacement bit could fit right inside the outer bit of the broken part. Used some superglue to fuse the two parts into one. With its new inner bit part now non-damaged the cube is just about as good as new. You can't even tell any repair work was done!