So I have bought a brand new circular saw. Fitted the blade with the Allen key. Turned the thing on and tested the blade. The safety guard thing has come down a bit and the blade may have hit it. It's now jammed. Never even touched a piece of wood. Don't know if it is me or a faulty saw. I've tried to use the Allen key to take the blade off, it's stuck solid must be a safety switch. The guard that came up when I put blade up is stuck solid at 8 o'clock to the left. It came right up to 12 when I put the blade on don't know what happen. Is there anything I can do?