*IMPORTANT* You'll want to create a full-length sole and pre-punch one hole for the screw base. Only 1 screw is needed to attach this heel to your shoe. We recommend that you don't trim the back of your insole board, in order for your metal shank to not be in the way of your screw. You may also need to bend your insole to get the best heel pitch. Please note that we don't have any spare heel tips, so make sure that you glue them securely in place. 😉