Official Website:
www.BigJimFPV.com
As I had to replace the lens on my Runcam 2 after a recent crash, I figured I would provide you with a quick tutorial. Its really easy to do, and just replacing the lens itself is cheaper than you can buy the replacement lens module for on the RunCam website (The GoPro lens also has a wider 170 degree FOV over the stock one).
Replacement GoPro Lens: goo.gl/nKGJQW
Replacement RunCam Lens: goo.gl/t8LNrY