Hey everybody, I'm new here, and I need some help. You see, I bought myself the Rubies 2-Piece Jango Fett helmet, but since I'm just a kid, it doesn't fit very well. I had an idea to take the straps out of an old bicycle helmet and put it into my Jango helmet to secure it better to my head, but it's not really working out so well. Any tips? Pics below.
I've also got the head piece from inside an Optimus Prime helmet:
Back view, with adjustable strap: