I just upgraded my wife's LX's cracked OEM key fob with a titanium reinforced YotaMD fob from
@suprarx7nut. The fob twisted off easily enough but left a tight plastic remnant surrounding the base of the key blade that I wasn't able to get off by hand.
Being that I didn't have a vise handy, I just locked the blade base with vise-grip pliers as close to the remaining plastic as possible and used a pair of cutting pliers to grab and twist off the plastic that was left holding on to the blade. Looking forward to not having this problem again anytime soon with the super stout upgraded YotaMD fob!