all you need is a small black hair elastic band easily found at a dollar store and put it around the lens
hair elastic band
falling loose
set half sitting over the zoom ring
other half over the black ring where the word macro is, above the focus ring
and it's done
might not work for heavier/longer lens as there is limit to how much the hair elastic can hold
sort of modified the one on instructables. that one teaches you to slip one end into the gap of the focus ring. i tried it with another lens and when i zoomed, the whole elastic ended inside the gap. the autofocus will not move and you can hear the motor working. had to spend time using tweezers to get it back out. just make sure it doesn't fall into the gap. thicker elastic may work as well as i'm not slipping the end in the gap, i just used the materials mentioned on instructables