SPLINE is the most commonly left out item. Did you order 2 sizes, just in case? An extra piece of spline now is cheaper than an extra shipping cost later. If you're weaving a seat with a dowel frame (flat reed, fiber rush, splint, etc.), you're going to need at least ONE 4" SPRING CLAMP to hold you work when you take a break.
Thank you for understanding that we cannot add to orders once they are placed.