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.