The leg tenons were created extra long. Once the seat was shaped and legs inserted through the mortises I marked the tenons for 1/8 inch proud.
Hickory pegs created to draw bore the stretchers into the leg mortises. After a final dry assembly, the stool was glued together, wedges driven and proud pegs rounded over.
Several coats of my usual shop-made varnish/BLO blend wiped on and wet sanded to soft, satiny feel.