How to sew a fly front zipper

The white strip is just a "PP strap". (11:52)
This is in order not to slide while sewing (sewing gap).
When the thickness of the fabric is different, the pressure of the presser foot and the feed dog are not stable.
Putting this tape means adding the height, this is very useful.
It is used for stitch guide in this case.
This is called "loop turner". (03:31)
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1 needle sewing machine : DDL-5550N JUKI
1 needle overlock sewing machine : MO-3604 JUKI
Bar tack and Eyelet stitch sewing machine : LK-1900ASS JUKI
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We have sewed at Shibuya-ku, Jingumae in Tokyo for more than 35 years.
This is a machine translation and may not be a perfect translation
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