Hello all!
This seemed like a very knowledgeable group so I thought it would be worth reaching out in the midst of my repair of my vintage Singer model 648 (maybe Touch and Sew?) Zig-Zag sewing machine.
As with old machines, I had a broken plastic gear. I was able to isolate the problem to the top gear of the vertical shaft, that connect just below the main horizontal drive shaft of the machine, as viewed from the top. The part I ordered was #16338 if that helps give context.
I have started the repair by following
this YouTube video that walks through the same steps I have taken, from removing the bottom horizontal shaft and gears, up until removing the set screw of the gear I am replacing. Unfortunately, when getting to this step, I noticed the gear does not appear to have a set screw but seems to have a series of 2 rivets, along with a screw hole. Despite my attempts, these rivets do not appear to have any hex wrench placements and are simply stuck into the side, preventing the shaft from falling out the bottom as seen in the video.
I’m wondering if anyone has run into the same situation with their broken gears, and if there is a way to either remove it, or take out the gear from the top. I was hoping I wouldn’t have to remove the main drive shaft, but if there are clear steps to do so, I will. I’d prefer to not have to take a dremel to the gear to get it out (mostly because I don’t have one and don’t want to damage the machine!)
I have attached some images in the imgur link below, please let me know how I can help further clarify or if there are other steps I can do to keep this great machine running!
https://imgur.com/a/CdgmUY9