I have a 29k71 and it's almost just like the 29-4 (I guess the 71 is newer). I haven't had a lot of time to play with it but what I did do, didn't work very well. I got the machine for a song and even paid a guy to tune it up for me got some needles for it and now all I need to do is learn how to use it. The thing looks awesome, it's like new. the guy I had tune it up for me said it was the nicest one he had ever seen but I still don't know how to use it. I think I might be using too light of a thread. I try to sew with it but all i get is a tangled mess in the bobbin. It just about drives me crazy because I have a lot I would like do with it. Matt