Way above average. Straight and very smooth working. Only one available If you do not know how to install I have a PDF on getting the door panel off and a video on wokring on the window regulator. These can be purchased separately below.
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123 Chassis Door Maintenance and Repair by Kent Bergsma - Download
This repair guide covers all 123 chassis Mercedes sedans and wagons built from 1977 to 1985. Fits 240D 300D 300TD 300CD 280CE Removing a 123 chassis door panel and doing related door maintenance and repair are all fairly easy jobs for the do-it-yourselfer.
Power Window Regulator Troubleshooting, Repair and Replacement - On Demand Video
Malfunctioning and failed power window regulators (mechanisms) are so common on older Mercedes that Kent can almost guarantee if you own one and drive it regularly you will have to fix one at some point.
Late W123 Sedan and Wagon LEFT Front Window Regulator and Motor - Used
This is in exceptional condition for a driver's door window. Way above average. Straight and very smooth working. Appears to be an OE replacement. Super hard to find one this nice. Last one available.