I noticed in your reply to Rck that you once had a Necchi BU and that the only thing you could not unfreeze was the feed dog drop. I have the same problem with my Necchi. I purchased it at a thrift store and works fine except for the feed dog drop. It sits on the right side of the machine and is a silver knob with a screw in the side of the knob. Do you have any idea how I might go about solving this problem. Any help would be appreciated. Thanks. Lucy