As much as I like the simplicity and fun factor of this figure, he's got a bit of a balance problem in dino mode, being too back-heavy to pose easily. So, I drilled holes through his back claws, and pinned in long spurs (I recycled bits of TF Prime Thundertron's claw weapon, but any suitably long, thin object will do). The spurs fold up in robot mode, and are more than stiff enough to support Grimmy in a more aggressive stance in dino mode. I also gave him a tetsubo I cut from a leftover missile; it stores inside the tail in dino mode.
That mod makes it much better! omy but still rid grimlock looks like a ko chinese toy lol.. @soundpulse is ur dp of halo custom edition?