How to Repair Stitching in Leather and Heavy Fabrics

Insert a needle through the next stitch hole. (You will always be putting the needles into existing stitch holes, not piercing the leather to make new holes.) Pull the needle through. You will now have both needles on one side, with one thread behind the other.

If you find it difficult to push the needles trying protecting yourself with thimbles or use a "palm". Thimbles you'll find almost anywhere you can buy fabrics and palms are available through leather craft retailers.