I'm looking for feedback on the actual finished difference of a turned bag with piping using regular stitching iron teeth vs round hole teeth. I've heard that round holes produce a cleaner look, meaning less likely to show stitching holes. I haven't had that issue yet, but I've only made two turned bags with piping. The main drawback I've heard about using round hole teeth is that they are much harder to stitch because they're smaller. Any thoughts?
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I think it depends on the type of leather you're using. I've only ever used the round irons once and I found it a pain to stitch with. Regular irons cut a slot that releives the pressure for needles to travel through. whereas the round irons stretch the leather apart cutting minimal leather. Thin leather shouldn't be a problem, but thick leather may be a struggle to stitch through, especially when paired with thick thread.
Round holes (not punches) make a lot of difference both look wise and strengh wise in general.
With piping, they will make less of a difference when it comes to look as the piping itself acts as a "shield" to hide what is behind it(i.e the holes).
As far as the holes being harder to stitch goes, i personally have never had such an issue. All hidden seams i make (in everything, not just bags), I always use 3.0mm round teeth. As long as you do not pair them with 0.8mm tiger thread, you should not encounter any issue stitching.