Janome 4800 memorycraft QC: feed dogs feel too smooth and don't advance fabric when I start sewing. When It starts, the stitches are too small.

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Your machine probably has an adjustment to increase the amount of pressure the presser foot applies to the feed dogs. However, if the machine has had a lot of use, the feed dogs could be worn or need some adjustment. To prevent wearing the feed dogs, try to avoid running the machine without fabric between the presser foot and feed dogs. Feed dogs can be replaced, if necessary.
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