I have a Singer 4830. I don't know what I did but my top stitching is on the bottom. I have read through my manual but can't find any way to reverse it. I took out the bobbin casing, cleaned all lint out. I also top off the bottom to clean all the lint out there. I never thought to remove the bottom of my machine before, it was full of lint. I have made sure it is threaded correctly, adjusted the tension, but nothing seems to work. Can anybody out there help me please.