The blade itself is not broken, there was a small collet in the middle. If you zoom in on the product image you will see a serrated gold collet in the center of the blade around the hole. This came to light when I was cutting a granite slab after about 5 minutes of use. So it was that I got a good return on the saw, although fortunately I wasn't injured. The Makita saw I used came with a blade and I used it to finish the job. I tried putting the collet back in place but it wouldn't stay and after that I couldn't fully tighten the blade. Extremely disappointing.
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