Having just retired from teaching high school machine shop, wood shop, welding, small engines, and everything in between for 34.5 years I readily recognize that grinder. It is equipped with all of the “safety equipment “ that the safety nuts decided had to be put on all, and I do mean all power tools in the shops. Anything that rotated had to be guarded. Sometimes to the point of not being able to run the equipment as it was supposed to be used. Large shut off switches like that were hung on every power tool. They got in the way of operating the equipment in some cases. Even machines that had magnetic control switches from the factory were not exempt from the madness. Our grinder like that had a magnetic control, but they said no to the machine and bought a new machine that didn’t have the magnetic switch, just a toggle and then proceeded to put a magnetic switch on it! One of the things they wanted to have happen was that the machine could not restart if the power failed and then came back on. No amount of talking would convince them that a magnetic switch would not allow it to restart. Had to wire in a new one somehow. The magnetic brakes were not installed on my machines for some reason, but I did have 3 saws that had stops on them already. Two of them were Sawstop table saws. Neat technology. If you have never seen it, just check your favorite search engine. Those grinders are awesome. Nothing like those old beasts!