http://www.quiltingboard.com/main-f1...s-t160607.html
Toward the end I posted something about cleaning the zig zag parts #14 window. If you have questions feel free to ask. Right now for the life of me I can't remember how to reduce the pictures to get them posted on here. If you want to pm with your email, I'll send a pic of what you need to look for. It is possible you have a bent needle bar shaft. I had a machine did that - someone must have pulled something really heavy through there. I changed out the needle bar and it works great. It could be that your needle bar just needs some adjustment. I could not see that my needle bar was bent until I got it out of the machine. I figure if I can follow a pattern, I can follow instructions in a repair manual. If some of the dodos out there working on machines can occasionally repair a machine I can too.