Reduction Pulley for Kenmore Sewing Machine 158.161
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Speed down, torque up. Better control at low speeds.
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This part adds a reduction pulley to the Kenmore 158.161. I suspect it will work on similar models like the 158.540.
The mount uses a pulley from a Kenmore 158.12511. This pulley may also be found on models 158.12510, 158.12512, 158.12520 according to the eBay listing.
Top belt is 14.375" and bottom is 10.25" The pictured bottom belt was temporary and replaced with a normal v-belt. Both top and bottom belts tightened at the minimum adjustment length.
You will also have to reverse the pulley on the motor. I used a ball-shaped diamond bit in a Dremel tool to make a hole for the setscrew to seat in.
The chain link on the front just makes it easy to align the mount and motor pulleys. You can omit it and slide the mount back and forth until you are satisfied with the alignment.
I put double-sided tape on the mount pieces to make it easier to hold the mount in place while I tightened the hose clamp.
I used PETG, thick walls, and 50 percent infill.