Hi there under all that motorised framework should be a bronze coloured tag with what model it is e.g 29 - 4 or 29k ?? I have 2 x 29k58 and a 29 k 71 and most parts are interchangeable from what I have noticed ,but if you fix one part generally other parts attached will also need replacing e.g I replaced needle bar and had to also get new piston joint and feet to fit new needle bar as they are just slightly fatter or differt attachment threads (pistion joint ).Awesome wee machines they are though I would take motor away ,they tend to wear out quicker .