I know we all prolly have some heat shrink tubing...and i know we all have cell phones. I hated always having the wire fray on me from use and started doing this. I tried the pen spring hack where you wrap the spring around the cable but ran into problems cuz it started digging into the cable. This is prolly the quickest, easiest and best hack imo. Id say start short on the initial wrap...just in cast it starts fraying at the end of the heat shrink, and you can then just add a longer piece to reinforce. Never happened to me...but just in case.