Wendelspanswick
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So long as you earth the socket you don't need to earth the bolts securing the socket as there should be continuity to the back of the securing holes.
I need to be able to slow down my grinder. I do have a Bosch variable speed model but I'm fed up changing from a cup brush to a flap disc so want a cheaper one...can I use this safely?
http://www.ebay.co.uk/itm/NEW-Volta...053340?hash=item25b6772c1c:g:aHEAAOSwUuFWvFXi
I can get a Bosch 750 watt for £45 and the controller for a few quid as opposed to nearly £200 for a variable speed model.....
Thoughts/experience welcome!