I need help stabilizing a wall I cut down to a half wall. One end is connected by another half wall that is connected to an exterior wall. The other end is free standing and I can't figure out how to stabilize it. I've tried 10" heavy corner braces lagged into the vertical stud and also into the floor, did not work. I looked on the interweb and saw that I could run a 4x4 at the free standing end thru the floor and connect it to the floor joice below, I have access underneath, but found out the floor joice is directly under the half wall preventing me from doing so. How can I get lateral support to stabilize this wall?