Because the Laserkerf is not attached to the blade it has no effect on the performance of the blade.

The laser guides that are attached to the blade can have two negative affects. First, the tightening of the laser against the blade can cause the blade to twist slightly. I have a blade with a .125" kerf but when the laser is attached to the saw the actual kerf was.150" and there is a noticeable vibration. The second possibility is that the blade cannot be tightened properly allowing the blade to slip.

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