If your door bars are not X'ed, you may want to do that now also. If you seal or paint the bars where they go thru the firewall you will see flex right there. Triangulate the upper part of the X bar to the area your front bars meet the A pillar bars and it will eliminate this area of flex. AMHIK Hope this helps, Beep

PS. Looks like you are doing a good job with that bender!