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I don't know what a stitch cog is by your definition but I suspect that you may be referring to the cam stack worm gear, part # 310 007 03. These gears are available, however those produced and sold as after market parts online have ranged from bad to very bad. I would suggest that you find an OEM part (not a reproduction) that are still available from time to time on EBAY etc.
Changing the gear is not as straight forward as it may look. The proper replacement requires: 1. removal of the cam stack without damaging the machine parts, 2. removal and installation of the new gear with the correct alignment of the individual cams, 3. installation of the cam stack and pattern indicator without axial play, 4. correct parabola timing of the main-shaft worm wheel and cam stack gear, 5. synchronization of the zigzag and automatic cam parabolas, 6. pattern indicator timing, 7. checking and adjusting the automatic needle position. SewTechnical Home
if all the dial are set correctly for the zig zag, and the machine still won't do the zig zag stitch then it's possible that there is a gear or cam inside the machine that is worn or damaged. a sewing machine shop can tell you for sure.
at the cam gear. This is the unit that the cam connects to. It could
have a crack or be split completely. If there is a crack the cam stack
will have to be replaced. The parts are hard to get and a good
technician is needed.
The guy is right, dust kills the moving parts. try oiling the shaft that holds the needle up about 1/2 way and then run on straight stitch with no thread to work in oil, do this several times till you feel that it runs smoothly and you have a little movement side to side as this is necessary for your zig-zag. if that does not work it may be a cam or belt in the top part that needs replacing and you will need the repair to tell you that. I asked them to give me a quote before any work was done so I knew what I was up against. I love my machine so it was worth the 200.00 to get the parts replaced. It will sew anything cause it is a older model with metal rather than plastic parts. hope this helps good luck