I've been trying to sew lambskin leather, but the button stitches are to loose. I've tried rethreading it with the presser foot up and made sure it was between the tension disk and tightening the tension nob and still no luck. Im using a organ 16 X 257 leather needle and nylon thread and a teflon foot, original feeders and original needle plate. NOTE ITS SEWS PERFECTLY FINE WITH REGULAR POLYESTER THREAD USING A SIZE 14 SCHMETZ NEEDLE
How thoroughly have you cleaned out the hook race area? Take a clean piece of cloth, and wipe it out. Look for fluff, bits of thread, etc.... You might need to tighten up your bobbin casing. If there's a screw there, get a flat edge screwdriver and very gently tighten it a little bit, then try sewing a scrap of lamb. You also may need to interface your lamb, so it's more stable.
List the model number of your machine, so anyone replying will know exactly what you're dealing with.
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