Back in the day after Bob had introduced his P-80 Shooting Star which was a great flyer, us folks who bought his T-33 were expecting the same great flying habits and heard word that the scale undercamber at the root could cause problems for some flyers so the fix helped. It has always been my favorite jet. Easy to see with those huge tip tanks, millions of color schemes to pick from, and as kids growing up in the fifties and sixties they were at every airbase and airshow my dad took me.