I don't know how to backstitch. It's a singer zig zag 457 model. Thanks, Becky

I could not find the 437 manual (free), but Singer Support has the manual for the 457 model (free download). I believe its close enough to 437 for what you need.

See pp 53+ for cleaning and lubrication. The dogs should be included in one or more of the lubrication points oiled from underneath.


https://www.singer.com/search/support?lp=support&title=457

I believe it is called "bird nesting" and is actually a problem with the top thread. See, my answer to the other question you posted.

The machine has probably seized due to lack of regular cleaning and oiling.

Wheel on right side that controls the needle up and down is very tight...

Have you changed your presser foot over to the zig zag foot? On some machines it won't work correctly until you change to the correct presser foot.

What specifically are the problems with the zig-zag?

Joe, you might try a larger needle than you're using. You might also want to try a larger leather needle. You machine should take needles up to a size 18.

It sounds like the needle you're using is having a problem picking up the bobbin thread, and that might solve it.

Hi, here is a threading diagram for you which you can also print out to save.
http://www.sewusa.com/Threading_Diagrams/Threading_Pages/Singer_Sewing_Machine_Threading/singer_457_stylist_threading_diagram.htm
Happy Sewing!

email me and I will attach instructions [email protected]

Here is a guide for bobbin winding and threading the 457 - http://www.sewusa.com/Threading_Diagrams/Threading_Pages/Singer_Sewing_Machine_Threading/singer_457_stylist_threading_diagram.htm

There are manuals avilable online to purchase for the singer machines, SOrry I was not able to locate a site that has them for free.
.... http://sewingonline.co.uk/singer-manuals.html