If you want to perform adjustments for your Veli VL50 D then it is usually a good plan to have access to a Workshop Manual to use as personal reference if you want to know the way to take out a particular component much like the Door and fit it again in the correct manner.
Veli VL50 D Workshop Manuals offers clear distinct diagnostic wisdom for the vehicle so if something is wrong it can help you figure out what the issue is and tips to fix it. You will be able to determine if you can do this on your own or that the job is just too big it is possible to make a reservation for your VL50 D right into a local mechanic.
Veli VL50 D manual