As some of you know I like stripping things down see how they work and what it looks like in side and some times I post em up. Yesterday I helped my dad fit a new stepper motor to his Touareg cause the old was fault and causing his drive train to clunk and pump going around bends when bumps. Easy enough to do, just 5 bolts, 2 plugs and out it comes. The strip is really easy as well, 3 torx bolts and it lifts apart. Top cover removed showing the motor. Pulled the motor/coil out and you see the brushes. Its not very shiny, so assuming that's our issues for this one being faulty. End of the motor. In side is a set of planetary gears. And another set. And a third. That's it. its very basic. I expected a lot more from something that's worth almost Â£500 and controls the centre diff lock. O well. That's the inside of a stepper motor or servo motor or gear box motor depending on what you read.