Like Mulefool says, if you decide to cover the whole cantle , use escutcheon pins around the slots. If you decide not to cover the whole cantle, you can make scallops and nail them down with escutcheon pins. Attached is a pic of my Santa Fe style saddle that I built a couple of years ago. I used a mexican style rigging instead of a Sam Stagg rigging and it works fine. I also installed a rosewood horn cap with a solid brass Texas star inletted ( to cover the screws), bling bling !