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BackSpring, https://www.neutrik.com/en/product/ncj6fa-h-0 neutrik jack combo a Combo A series, 3 pole XLR female receptacle with 6.35mm (1/4in) mono jack, switched, with full threaded nose and straight PCB pins, https://www.neutrik.com/en/product/nmj6hhd2 Slim Jacks, 6.35mm (1/4in) mono jack, switched, half threaded nose and straight PCB pins, https://www.neutrik.com/en/product/nmj6hfd4 M Series, 6.35mm (1/4in) stereo jack, vertical PCB mount, retention spring instead of A4 Soldering, NF-Transformer ETAL P3188 SMD.