I inherited a B&D DNJ72V when my dad died in 1988. It's a 2 speed (900rpm and 2400rpm) and has a variable speed trigger. It stopped working last week, so I dismantled it today assuming that the mains lead was the problem as the outer cable had split. I tested the cable with a multimeter; both Live and Neutral gave a reading on the Ohms scale, so I assume it's not the lead after all. I took the cover off the brushes/armature section. Still plenty of length on the brushes, so I cleaned the armature with contact cleaner and a fine pencil type abrasive brush. Put it all back together but no luck. Here's some pictures; Armature section but not enough light for a clear view Shall I forget it? I have use of my partner's single speed hammer drill but it's no good for the slower speeds required for drilling metal. Also, does anyone know what speed wire brush power tool accessories are best used at? I have some de-rusting to do on my car.