For Strikeflier just push down on it's wings and you'll be able to place Battle Turbine on. A bit hard for me when I first looked at it.As for the Dragonoid, you should be able to push down on it's wings and tail and there's space for your Airkor.
There's just one problem...Helix Drago's pegs are too small and Airkor won't open up.
have you pulled the wings all the way down,maybe your Aikor gear is messed up
One thing, Sablera, Helix Drago doesn't go with Airkor in the show so it might not be compatible. Each gear HAS to fit the bakugan it combines with in the show, and it might fit some others, but not all.