Chuck, if you run a 2/56 or 4/40 rod from the bottom of the fuse outward to close to the tip of the horizontal stab that should be enuff bracing. Use plastic clevis on the ends and attach to small brackets. The rod will not need to be super tight, it just needs to keep the stab from flexing more than say a 1/4 inch or so up and down at the ends.

Ed M.