I had an inexpensive Singer once and the foot pressure adjuster was actually just a screw on the top of the machine, directly over where the foot was. As for the foot, it might not be for your machine but have you tried taking the lever on the right side of the walking foot and making sure it rests over the top of the screw that holds your needle in? My machine came with a walking foot but it still wasn't working right until I made sure to rest that properly. Hope it works for you.