[Brilliant yet humble builder]

MV Agusta

[Garage door opener troubleshooting.,.]

Take the cover off the motor housing and check the nylon gears that drive the motor shaft.  I just replaced mine as a lot of the teeth were worn out.  You can buy a kit from Sears Direct but I just replaced the whole thing as it was 30 years old and you had to take the old one out to repair it anyway. 

 

[Temporarily propping car window up]

Push it up and jam a rubber wedge shape door stop  between the window and window sill inside.