Mata Nui Update

I've been working on my Toa Mata Nui MOC, made a few minor adjustments to the arms and legs, and completely rebuilt the torso.  01 Kanohi look good as torso pieces, but making them stay in place is a nightmare, I've made them a little more solid than they were, but they still come off more than I'd like.  Don't suppose anyones found a good technique for holding '01 masks in place?

I also really wish the Ruru was available in Keetorange.