Here I’m using a 4 prong angled stitching chisel to cut holes for my stitches. You can also use a hand awl for this purpose, but it takes longer. The diamond-shaped holes need to be cut at an angle to the line
of the stitch to prevent the stitches from ripping through the leather. Nowadays I use a battery-powered Dremel tool to drill 1/16” holes.
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