Remember waaaaay back when Armada Unicron came out? How the fandom screamd joy in unison? I know I do. Remember the dreaded Powelinx-gimmick chest missile? Remember how it refsued to stay shut? Well it seems I forgot about that. Was there ever a fix for that? I'm just about to open him up and remove the gimmick permanently, it's that annoying. Your insight would be appreciated in this time of need.
Step 1: Give up Step 2: Sell him Step 3: Get the Takara version. Seriously though, I don't think it ever was fixed. I myself heard a plenty about the premature chestbursting problem which prompted me to go for the MX-00 instead...which, admittably, carries a bigger pricetag, but still...
The surgical procedure was a success! Unicron's chest cannon mechanism works in the same fashion as, say, a G1 seeker's missile catch mechamism; a hook grasps onto a groove in the back of the cannon. I merely gouged a deeper groove to give the hook a better grabbing surface, and it worked. Go me! I thnk its time for a sammich now.
That's all? Oh well, at least I got the Takara box. I only keep the packagings for my Japanese toys because of their uniqueness.
Gimmicks.... I toyed with his chest gimmick once and forgot about it. and he's never had to see a Cybertronian Cardiologist.