I actually helpled build SIr Killalot (the house robot in robot wars) and the claw was the claw that rescuers used to tear the metal of cars and safe the people inside. They're called the Jaws of Life. That would be a great but heavy addition to your robot. The radio they used for Sir Killalot was a Futbaba 9cp (i'm not sure that's what it's called exactly) and the servos were all heavy dutyhigh torque servos/ I understand that you don't want to build something of that size, so if you have any questions you can ask me. by the way SIR KILLALOT RULES![8D]