Headlight actuator Adjustment

I have a 1999 C5 coupe. I recently tried to manually open the passenger side headlight to replace the turn signal. In doing so, I have messed up the adjustment of the headlight (but did manage to change the turn signal). Now the light opens fine (when I start up or use the headlight switch) BUT when they close, the actuator keeps spinning for about 5 seconds, making a loud "rapping" noise. How do I adjust it to stop the noise and probable damange being done?
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