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This is a short addendum to my earlier post here: https://coffeeforums.co.uk/content.php?397-Electrical-Safety-Your-house-and-your-appliances A number of us buy secondhand so lets think about that for a start. First off you cannot be certain that everything is still how the manufacturer put it together. I am going to suggest that you should assume it may have been "worked on" I have read a couple of posts today relating to getting an electric shock from the machine and the simplest answer to why that happened is: IT WAS STILL PLUGGED IN EVERY TIME you are working on an electrical machine UNPLUG IT then try to turn it on to double check. Now lets revisit that thought about the wiring etc not being quite original. The most important connection is that of the safety earth, that little yellow and green wire. It is not unheard of to find this connected to the base plate alone. If this is the case then when you undo the base plate for access inside the grinder then the body is no longer earthed. If at this stage you plug in to observe things in action and there is a fault you could get a shock from the body of the machine. Solution? add a wire from the earth terminal of the incoming mains lead direct to the machine body (mostly any bolt on the body will do) best to use ring terminals if you can. Another benefit here is that you are not relying solely on the base plate screws for safety in normal use. I am all for you folks doing modifications and your own servicing but please... THINK SAFETY AND DOUBLE CHECK Thanks for reading