Front View (from the balance wheel side of the machine)
Side view Top View
and views from the Back side (side where the motor/balance wheel attaches to the machine)
You may be wondering why so many photos. It’s because there isn’t instructions in the Adjusters Manual for this part of the machine. Also, when I cleaned and replaced this mechanism/assembly on my 15-91 I didn’t take that many photos and I had a bugger of a time putting it back together again. Eventually I did get everything working again on the 15-91, but not without a lot of cussing, disassembly, reassembly, trial and error. I’d really like to avoid that this time!
Anyway, the first step is removing the screw that holds the bobbin winder wheel in place. My bobbin winder tire ring (fat gray thing) is not in great shape so it will need to be replaced. Fortunately my local sewing machine shop carries these in stock. If you aren’t so lucky they can also be found online at a very reasonable price (<$1)
Finding a replacement spring turned out not to be very difficult. In fact, you can purchase an entire bobbin winder assembly or just the parts you need from places such as Sew Classic at very reasonable prices (Woo hoo!)
The next thing to do was removing the bobbin winder stop latch which is done by simply removing a single screw. Note, this part is supposed to be shiny with chrome – not red with rust. In the next two photos I attempt to show you with the end of a toothpick that there is a tiny hole in the ring portion of this stop latch.
Hopefully my Evapo Rust will arrive tomorrow, because I am just itching to try it out on these poor rusted bobbin winder parts!
I learned the hard way with my 15-91 that this is important because this hole is used to hold one end of the spring in the recess below the stop latch. That little spring has 2 tiny ends on it – one end fits into a hole into the spring recess and the other end fits into the hole of the bobbin winder stop latch.