How do I correctly adjust the V-belt tension on the S-1000A?
Turn the two nuts to adjust so that there is 10–14 mm of deflection in the V-belt when it is pressed at the midway point with a force of 5 N. All cords should also be secured at least 25 mm away from any moving parts.
From the official Brother S-1000A Sewing Machine manual, page 11
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