Just come back from the down below where I've been working a the latest project. I've always been wary of machines that spin blades faster than I can think and now I know why. I was about to chop a 6 cm square length of Ash with a Powerbase mitre saw, had the ash on the block squeezed the trigger and started to lower the blade into the wood. The blade had barely made contact when - big bang, I release the trigger and the wood jumps up and lodges against the blade guard. That was the least of the wories once I started looking to see what had happened. I had thought that something akin to table saw kickback had occurred but no. The retaining screw that holds the washers etc against the end of the blade arbor has sheared through and the blade has jumped off the arbor and is just hanging in the housing kept in place by the plastic guard, literally resting free against the guard. Machines - who needs em!