Somebody recommended these ball point 135x17 needles in one of the previous posts. They work well with no mods on SpeedyStitcher. I've done 8mm cord using .61mm thread. I also used them with .71mm thread repairing some throwline cubes. I don't think the eye with accommodate any larger thread without some patience.
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There's nothing in that listing about them being ball point. How do you know that's what they are?
Has anyone dissected a sewn splice to show how many rope fibers are cut or damaged by the process? It would be interesting to see pictures.