Upper Tension Take-Up Spring
Replica for Singer 221, 222, 301 and many more Singer Models
The standard tension is set at 3-4 for quilter’s cotton weight fabric. However, if your standard tension is set considerably different, you might try calibrating it by disassembling and reassembling the Tension Unit completely - starting the gauge from scratch.
Following the illustrative photos above, use the following information to calibrate your Tension Unit.