I tried searching for this but had no luck. And I've changed blades many times before by simply using a short 2x4 to keep the blade from moving. But now the center blade on my Lazer Z is giving me a problem in that even with the blade restrained with a block of wood, the spindle and the topside pulley turns so that I can't remove the blade bolt. If there's a trick to locking the spindle so I can remove that bolt, I'd appreciate hearing about it. I thought of removing the belt and using a big pipe wrench on the pulley, but I'm afraid I'd damage the pulley.