How to keep iphone charger from breaking and bending?

Well this is my 3rd charger I got 4 days ago, and I tried to use the spring of the pen and twisting it around, it's very hard for me to do it, well my dad is very capable of using iPhones and iPads, he told me about using the spring, a also he told me that I could use a tape. I couldn't really find electrical tape, so I used blue tape, so how do I keep it from bending it?

Same thing has happened with me and my iPad, I have bought about 6 chargers this year. I have now just used my phone charger and bought an adapter to make it charge the iPad too. (The phone chargers seem better quality) But its like your dad said with he tape, that's the method I use, and this has worked well for me for a few months now.