I have lots of M12 tools Yup can't say I've noticed the rubber bumpers inside any before
I have to wonder now how intentional that is and if maybe its not going to be exclusive to just the grinder...over time more than few have talked about loose batteries on M12 tools because of vibration while in use...Multi tool comes to mind
Just looked at my cutoof tool (I'm thinking purchased it like just over one a year maybe)

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Not any different than the rest that I can see and I never really notice vibration with it ether at least not enough to mention. RPM is similar so maybe the long straight driveline of the grinder could be the difference tho
Ah I see, I had no idea about people complaining about loose batteries in some M12 tools. Good to know.
I think you may be on to something. My guess if the accessory is larger in diameter & not well balanced, the long length of the inline die grinder body would amplify the vibration at the battery.
Like today I put on a 2.5" cut off disc. New it wasn't perfectly concentric, gave a bit of vibration at high rpm. After a cut or two the wheel worn down concentric & the slight vibration went away.
So like with your cut off tool & the RA die grinder, because the spindle is not inline with the body vibration from the accessory is not much of an issue.
My RA die grinder has a white plastic stick that I guess serves a similar purpose. I think it was in one of AvE's BOLTR videos where he talked about this teflon stick or whatever on another M12 tool that is to help eliminate the play for the battery. It's not for aligning the case or keeping it together cause there is a screw right next to it.
My M12 stick light has that metal clip like your cut off tool shown. But that's just for keeping the case together as there is no screw in that area. My Fuel ratchet doesn't have that clip since there is a screw there.
So like you I wonder if we'll see more of this dampening features in future M12 tools.
