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I used OCR software to import the parts list for the 431. I manually compared the 431 parts list with the parts diagram for the 401. Many of the parts are interchangeable. The following pictures show the 431G Parts Diagrams:

My 431G came with a messed up zigzag needle plate. Someone had drilled it to accommodate a flat-head screw. Replacement needle plates for Singer 431G machines are extremely hard to find. I successfully modified a needle plate from a Singer 700 series machine to fit my 431G. I ordered a Singer 174198 needle plate from… Continue reading 431G – Adapting a 700 Series Needle Plate

I worked to re-create an uncluttered 431G manual that included the information for chain stitching. This document is a combination of other information I found online. I have spent hours cleaning the graphics and re-typing portions of the text to match the original document. I have done my best to update the diagrams and page… Continue reading 431G 108 Page Manual – Rebuilt

After you set the machine on its side and remove the bottom cover of the free arm, you can push the needle plate pins out from the underside. The pin on the right may be obstructed by the feed bar. Adjusting the stitch length to maximum will help you see the hole below the pin.… Continue reading 431G – Removing Broken Needle Plate Pins

The needle plate pins for these machines were made from spring steel and were commonly broken. Only a few of the German 400 series machines used these pins and replacements are not available. The following picture shows a with only 3 of the 4 sides of each pin intact. Magnetic Pin Set – Game Changer… Continue reading 431G Needle Plate Pins – Permanent Fix

My original push nut broke when I removed the stitch plate cover from the lid. I ordered 100 4mm push nuts from McMaster Carr for about $15. These fit the cover and I now have 99 to spare. I found the easiest way to install these is with a 1/4-inch or 6mm nut driver. It… Continue reading Attaching the Stitch Plate Cover to the Lid