I was looking for someone to make a custom leash from my dearly departed bullmastiff. What was once quite stiff was rendered butter soft by his, uh, enthusiasm. I found Paul Costagli (he posts as PAC straps) and with whom I couldn't be more pleased. The leash was 20 mm and quite thin but he was able to stitch it together and stretch it for my wife's Laco Saarbrucken. The cross stitching was his idea and he was able to incorporate a lot of the original stitching as well. All in all, good guy and great work.
I couldn't get pictures to attach so apologies if this cross pollination isn't allowed. It seems most of us dabble so I assume it is ok.