Well, if four years is not too late! What I found using glover's needles is that you can use a saddle stitch by sliding one needle along the "flat' on the other needle. To do this you partly penetrate the leather with one needle and lay the point of the other on one of its flat surfaces while the first needle is still in the leather. You then slide the second needle through so that both needles are in the leather at the same time sticking through the same hole. Then pull through (try to avoid leaving blood marks on the leather!!).