Thanks guys, the waist cannon wasn’t a mod if I recall correctly. Rather I just spun the turret and then folded the cannon out toward the front. I think that’s it.
Haha... you're thinking of the original Armada Megatron! This version, the arms become the turret, so it's never on his back - the cannon stays on his arm. I'm assuming in this case, you just popped it off the arm and attached it somewhere on his hip? zmog
Your comment motivated me to look more into it and I think I have the answer now. On his back there are connectors that his backpack used to be attached to. I am positive now that I screwed the cannon into one of those connectors and then folded it around his hip. Check out this pic. You can kind of see that. It's been over 2 years since I did this one. i wish I could remember better but I think that's it.
Ah, that makes sense. In that case, you'd actually have to unscrew the cannon as part of transformation... I guess you'd need to do that anyway to reconnect the treads. zmog