Super 1050 Upper Machine Assembly
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Super 1050 Upper Machine Assembly

Stock Number: S1050 UMA
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Note: If you are replacing the mainspring (stock#12572) on a machine made prior to January,2016, the spring is now longer. This requires replacement of the spring bushing (stock#11335) as well, to accommodate the longer spring. To verify, measure your existing spring. The current spring is 10.5" long. The earlier spring was 8.5" long.
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