Posted by a reviewer on Amazon

There doesnt seem to be any noticable vibrations when the rpms are turned all the way up

Posted by a reviewer on Amazon

Be careful not to lose the little washer that is sandwiched in between as this helps to hold things in place

Posted by a reviewer on Amazon

Probably burned through 10 disks so far

Posted by a reviewer on Amazon

I had to tap it with a hammer to get the halves apart

Posted by a reviewer on Amazon

After repairing the grinder i chucked this mandrel back in and turned it true with a thick cutoff disc in another grinder while this mandrel was spinning at 25k rpm

Posted by a reviewer on Amazon

When theres no more black it should be better

Posted by a reviewer on Amazon

After making it concentric and removing a bit of unnecessary mass from the head the vibrations went away

Posted by a reviewer on Amazon

Unfortunately i had no way to face the bottom of the disc retaining screw in situ but it was close enough to begin with that the discs now sit perfectly flat and i did not need to fudge with it by say adding a cardboard washer or an oring between the disc and the retaining screw