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Do twin-blade circular saws reduce tearout?

Do twin-blade / Twincutter circular saws produce a more accurate cut than regular circular saws? Do they have less kick-back? Do they reduce the tearout / splintering / chipping at the rear of the ...
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How can I figure out why my circular saw has stopped working?

I have a Hitachi C 7SB2 circular saw that has very few hours on it, but is perhaps 10 years old. I cut a piece of wood, put saw down, then tried to cut a second piece, but the saw would not run. I ...