One thing to check. That model came by default with rubber feed dogs. They may need to be replaced by now.
The part number is 181843, or 181843M if you want the metal dogs. Easy to change, 2 screws accessible from the top. The worst part is finding a screwdriver that will fit under there. They're not expensive either. I think I've seen them on the net for about $10.
There's a needle plate screwdriver you can get that will likely do the trick, 357306 is the part #. Look for a good deal on it though, $8.99 and $5.99 at the site I saw the first hit on is ridiculous. My cost on it is $0.39.
Last edited by ArchaicArcane; 10-10-2012 at 01:49 PM.