Quick Info
Model
450, 452
Estimated Cost
< €5
Difficulty
Beginner
Time Required
15 – 30 Min
Safety Notes
Eye Protection: Always wear safety glasses when drilling metal screws to protect your eyes from flying metal shavings.
Glue Handling: Use heavy-duty polymer glue (like Pattex) in a well-ventilated area and avoid contact with your skin.
Component Fragility: The internal mirror cables and plastic housing are delicate. Use gentle pressure when extracting or seating the adjuster to avoid further breakage.
Drill Safety: Ensure the screw is securely clamped or held before drilling into the head to prevent the bit from slipping.
Dry Time: Do not attempt to test or move the adjuster until the glue has fully cured for at least one hour, or the bond may fail.
Step-by-Step Guide
Introduction
If you own a Smart Fortwo (450) or Roadster (452), you've likely encountered the frustration of a snapped side mirror adjuster. Over time, the internal plastic or metal rod that connects your cabin joystick to the mirror glass becomes brittle and snaps, leaving you with a mirror that you can no longer position correctly. Traditionally, the "official" fix for this is to replace the entire mirror adjuster assembly—an expensive and time-consuming process that often requires dismantling the door.
In this guide, we show you a "Smart Racer" alternative: a 50-cent repair that is often stronger than the original part. By utilizing a standard 6cm hexagon-head screw and some heavy-duty polymer glue, you can rebuild the internal mechanism of your adjuster without needing to buy expensive OEM parts. This repair is invisible once the rubber cover is back in place and restores full functionality to your mirrors, ensuring you maintain perfect visibility on every drive.
Select the Repair Screw
Find a 6cm long screw with a flat, hexagon-style head. The flat head is crucial as it will provide a stable surface for the mirror cables to interact with. The hexagon socket in the head also provides a perfect centering point for the next step.
Drill the Screw Head
Using a 3mm metal drill bit, carefully drill a hole into the center of the screw head. You should aim for a depth of approximately 2cm. This hole will act as the new socket for the internal adjuster rod, creating a mechanical bond that is much more durable than the original plastic.
Apply High-Tack Glue
Clean the end of the broken adjuster and the new screw hole. Apply a small amount of heavy-duty polymer glue (like Pattex One For All) to both surfaces. This glue remains flexible once cured, which is essential for the pivoting movement required by the mirror adjuster.
Assemble and Cure
Press the screw into the adjuster assembly and ensure it is perfectly aligned. Wipe away any excess glue that may have squeezed out. You must now let the assembly sit undisturbed for at least one hour to allow the glue to reach its initial strength before installation.
Install and Reattach Cover
Once dry, slide the repaired adjuster back into the door housing. Test the movement to ensure the mirror glass responds smoothly to your inputs. Finally, slide the original ribbed rubber cover back over the new metal rod—this hides the repair completely and protects the mechanism from dust.
