Generally, the lighter the fabric weight, the heavier the presser foot pressure. Yes, feed dogs do wear with use. Do not run the machine without fabric between the presser foot and the feed dogs--the feed dogs constantly rubbing against the presser foot will quickly wear the feed dog points. Store the machine with the presser foot down with a pad between the presser foot and feed dogs (even a scrap piece of fabric will do). Also, be sure to clean the feed dogs of any gunky build-up. If the feed dog points are worn, it may be worthwhile to have them replaced.
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