Every time we open or close a door, we use the door knob or handle. After years of use there will come a time when you may face problems with your door knobs or handles. You may either have a door knob stuck or a rusted door knob. This is the time when you need to change the door knob. If you wish to perform the task on your own then you need to have knowledge on how to change a door knob. However, if that’s not the option for you then you can hire a handyman service for your door repair service. A1 Handyman Singapore offers all types of door repair handyman service list.