Yeah of course
. I took my c220 there to have the headlight position moved up a little (bi-xenon auto Leveling) It has 2 star screws to manually move the beam patern - should have been an easy enough job that I could have done it myself but since the car was going to have some work done I asked him to do it. (I think it can also be adjusted by Star)
anyway, he failed to notice that there were adjusters on it and took off the bumper, removed the headlight broke off the plastic molded bracket that is part of the headlight, re-fitted the headlight and screwed in a self tapper to what was remaining of the bracket and re-fitted the bumper minus the metal c clip that holds the bumper and wing together.
So end result was a broken £800 Bi-Xenon headlight that didn't need any modification to it!
When I was there he asked me why did the car have a sensor on the rear axle if it didn't have self levelling suspension. To anyone that doesn't know its for the self leveling HEADLIGHTS - not what you would expect from a "Mercedes Specialist" but then again he didn't train with Mercedes it was Ford - I later found this out by someone who used towork with him. But thats not to say that the guys who work for him aren't merc trained.
Took a W210 E320 CDI to him that was chucking thick black plumes of smoke, he took it a run and said it just needed a run, many many spirited miles later it wasn't any better, so I ended up taking the egr off and pulled out the gunk that was in it - I wasn't intending to do any work on the car myself but ended up doing so.
Before the black smoke there was a wobble under braking, he suggested a new wheel bearing and it ended up being a warped disc - It wasn't me that took the car that time.
I have a few more stories that I can share but I think I've done enough bitching, and if you want to see the photos of the headlight I can post it up.