So I'm trying to draw splines and having some difficulty. My setup is a basic single girt housed into a post at either end. The through tenon is mortised through the post into the girt and held with 3 pegs at one end and wedged with three pins on the "open" end to keep it all together. Creating the shoulders on the girt and having them cut into the posts at each end works fine. However, when I slide in the 2x8x24 spline into position, I loose all of the joinery created by the shoulders in the posts and the spline does not appear to "cut". Is it possible to use a component to cut into a component? I moved one of the splines out from the frame on Clarks example frame and the spline it appears to have no structure on the center portion which cuts through the post.