Number Indicator, Singer Featherweight Tension Unit (Vintage Original) vntsale You can see in the

You can see in the antique baby garment how a similar effect was accomplished with the thread weaving in and out forming a wave-like effect

Vintage Original Featherweight Case Clasp (as indicated by the red arrows) for the Singer 221 & 221K

This buttonholer is still preferred by long-time sewists

or adorning a Christmas stocking

Number Indicator, Singer Featherweight Tension Unit (Vintage Original) vntsale You can see in theThis is the numbered portion of the indicator that gives you a reference for thread tension. The part is an original piece in excellent condition that has come off of a Featherweight tension unit. If you would like to purchase a complete tension unit, click here. Check out our blog post tutorial if you need to know how to assemble the tension unit, or if you are not sure about what part you need.