Photoshop :: Realistic Silver Effect

I have been working at this for about 4 hours and I am still stuck. I am trying to create a padlock from scratch, and have had nothing but problems. Below is one I used as a reference. I created a block for the lock itself and used a gradient fill on it. I then added some filters (noise, blurr, etc.) and came up with a decent though clipart looking lock. I think with some more time I can come closer to the desired effect. My sticking point is on the metal arm. I have tried and tried to duplicate this metallic silver look, and it just looks horrible.