How do you poke all those holes in a straight line!
The saddle stitching technique
https://video.nostr.build/75361e217617a9782757328625ff17700e81334758727f4819570a960f534a70.mp4
Discussion
Chisels. Will try to find a quick and short video to show the process.
Apply a stitching line then prick with irons.
https://video.nostr.build/f6b4fc8750d73a68e3152a352cbb0c3c8eca56e6fd89e3220db4f104aebbca1d.mp4