When Wallace and Gromit leave the Ancient Temple level (Act 1 Part 1, after Wallace invents the shoes with the springs), go to the room where you fight Feathers McGraw. To begin the fight, run around the room when Feathers runs into the wall. When this happens, a gadget will be shown on top of Feathers' vehicle. Also, it is impossible to double jump with your shoes with the springs. Instead, jump again, then on the second jump, he will jump higher after he hits the ground. After you get on top of the gadget on the machine, butt bounce on the gadget. Note: You will have a limited amount of time to get on top of the machine before you butt bounce on the gadget. When this happens, you will see bolts appear from him. Keep doing this until you defeat him.