Modifying my GoPro Hero4 case to accept a mic, or external charging with case on

Made a DIY video for people who wanted to see how I modified my case to accept a cheap China Mic. took me about 15 minutes total time, fairly easy if you're handy with tools. Goo mod if you're a motovlogger or into vlogging
I purchased some OEM cases off ebay, I think they were Hero3 cases