This glitch is cool and funny. First, find a Platnium Bolt. Before you get the Platnium Bolt, pause the game, go to the Weapons menu and select the Seeker Gun or the HK22 Gun. Get out of the pause menu and get close to the Platnium Bolt to get it. When Ratchet grabs the Platnium Bolt, you'll see that Ratchet's arm is missing. You can keep doing it until you get all the Platnium Bolts. If you have any questions, let me know.