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I started on the 7th motif, and immediately started to have problems with the needle grazing the metal of the walking foot, as if the foot had slipped slightly down and forwards.
I thought that perhaps the screw fixing the foot to the shank had come a little undone so went to tighten it, but it wasn't that - the screw was tight, but the foot was a bit wobbly on the shank.
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Boo.