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Sewing is best. I recommend going to a leather jacket shop or a bike event with lots of Harley vendors. There's always a patch booth and they bring their sewing machines to sew them on the spot. You can also use a contact adhesive like leather weld or tanners bond if you don't want to sew them or you want to apply them to a area that can't be reached with a sewing machine like the sleeve. You have to clean the area with acetone first, (use a rag). Then rough the area up with steel wool and/or a wire brush, then clean up the spot with more acetone. This will destroy the leather finish and rough it up to allow the adhesive to penetrate. Trace the patch with a pencil and make sure the acetone and scrubbing don't go outside the outline. When the acetone has evaporated, apply the adhesive to the patch and on the area traced. Best to use a small paint brush. Let it dry, then stick them together. Place a heavy object on the patch and let it cure for 24 hours, (a couple blocks of wood on the patch and the other side of the area sandwiched in a vice work well too). The patch should now be permanent for at least a few years. If you screw up the gluing, go have it sewed. Good luck.
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