This accessory is inserted into the eye of the upper looper on a serger (overlock machine) to disengage the upper thread. It allows the machine to operate using only two threads (one needle and one lower looper) instead of three or four, enabling the creation of specific finishes such as:
2-thread rolled hems
2-thread overlock for lightweight finishing
2-thread flatlock seams
Compatible serger models
This component is specifically designed for use with the following Singer models: [1]
S14 series: S14-68, S14-69, S14-77, S14-78, S14-79 (including models sold through the Lidl retail chain)
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