I played with the 'new' Necchi (page 932) this morning. The tension was way off, but I got it. How do I oil it? It's very stiff and there are no oil ports and only one obvious screw to remove - it's on the faceplate. I'm a little puzzled. I need to lubricate the knee pedal, too. It's stiff, too, but I do like sewing with one.