It is always best when sewing zippers, especially when top-stitching, that you sew in the same direction from each side. My industrial machine has a left foot and a right foot. My domestic machine has one foot that does both sides. From memory, the industrial feet cost me $6 each a couple of years ago from here. The invisible zipper foot for my regular domestic machine cost around $20. Still totally worthwhile.
Did you know you can get a thingamie to put on the industrial machine that makes changing the feet really easy? It's a spring-loaded gizmo that screws on to the shaft and then you just push the spring thing to release and change the foot. Well worth the investment if you (like me) get sick of using the screw-driver.
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