I made this, because I am quite sick of the sound when the door handle hits the wall. This so simple, even my grandpa said, that he could do this with closed eyes.
Step 1: Tools
Everything you actually need is hot glue gun with few silicone sticks. It doesn't matter what colour the silicone is.
Step 2: Making
Just put some hot glue on these places, where is necessary. Then wait for the hot glue to cool down and there you have it. Enjoy!