On Friday I bought a bench grinder to use in the shed for sharpening drills etc, but after bolting it down, it vibrated badly when I turned it on. The reason was that the stone on the right hand side was running out of balance, causing the unwarranted vibration.
I've taken the machine back to get it rectified, but I now have to wait a week until they can get in a new one, rather than take 5 minutes and swap the stone over. Such a shame as the one I bought will be scrapped rather than looked at.
Here's what the wheel looked like turning it slowly by hand.
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