Hi All.


Just did this job. Here's how to make it easier.

1) To remove the regulator without taking the arm off, you must open the wiring terminal at the switch and pull out the black and green wires going to the motor. Make sure to scratch a "G" next to the terminal where the green wire went to aid in re-assembly. Do this with the switch still attached to the terminal so that all the wires don't just spring out of the terminal when you take the back off.

2) Remove the two bolts and single nut holding the regulator to the door.

3) Remove the bolt that holds the bottom of the window guide to the door. This is the bottom most 10mm bolt. With this bolt removed, the window guide will be able to flex out of the way as you slide the regulator down towards the large hole at the bottom of the door. Taking the arm off the regulator is not necessary. If you can't get it to fit, try raising or lowering the arm electrically via the switch until it fits. The window must be all the way up to allow the rail to flex.

4) Using a grinder or a drill, remove the old sliding jaw. Be careful not to knacker the arm, or enlarge the hole.

5) insert the new jaw

6) Place a 5mm or similar sized socket face up on a smooth, hard surface.

7) Place the regulator assembly on the work surface so that the rivet at the back of the sliding jaw sits squarely on the 5mm socket.

8) Peen the rivet down until the sliding jaw is snugly in place. Be sure to seat the rivet squarely on the socket so that all of the energy from the hammer is transferred to the metal and not the plastic.

9) Slide the regulator back through the hole and up as far as it will go into the corner of the door by the latch.

10) Raise or lower the window by hand until the sliding jaw is in a position to enter the track. Slide the jaw into the track, then maneuver the regulator back down into its mounting position.

11) Re fasten the two bolts and single nut that held the regulator in place.

12) Re fasten the bolt holding in the window guide. Use loctite blue.

The rest is just reverse of removal.


Have fun.


Took me 30 minutes, but that was because I had to discover for myself how to get the regulator out without removing the arm and incurring the wrath of a tensioned spring. Next time will be more like 20 minutes.


Also, these jaws are only $8 from the MB dealership, and around $4 online.


J.