I haven't used the walking foot attachment much until the past few weeks. It works great and I'm pleased with the results, but it can be a noisy little thing. The first time I heard it clunking I had to make sure it was the foot and not my sewing machine. A problem with a foot is easier than a problem with the machine. I searched online to see if it needed oiling or maintenance I was unaware of. Nothing until I found some posts from a few people discussing their noisy walking foots (feet?). Someone even wrote the sound out phonetically--kuh-junk, kuh-junk. Ahh, what a relief--apparently its normal. Although to help with it remember it's a walking foot not a running or jogging foot. In other words, don't sew too fast with it. Blah! I like sewing at a good pace most of the time. Why must everything require so much patience from me?