I just noticed my saw has the same movement. I figured I could just tighten the center bolt. But I guess you say that don't work. Is there a shim or washer under the rotating portion that can be removed or ground down?
well, i have the cordless version of that saw with the 8.25 blade. perhaps a very minor complaint would be the smaller blades are harder to find, but the oem blade has been good.
In my experience, using extensions always lessens the torque on any impact, air or cordless. the more extension you have, the more it absorbs the hammer action. are you using solid 1/2" drive extensions?
its not really a clutch. its a spring loaded hammer mechanism. when enough pressure is encountered, the hammer rises, turns, and impacts. if its not hammering, is it stalling? any grease should work inside it.
its a nice little saw. very small and compact, which makes it easy to transport or keep in the van. it'd be nice if dewalt makes a saw like it with a bigger blade. 10" would be nice.