Got some vitamin D yesterday welding up my version of the Upper Arm Support tool (F1090-B) as shown in the factory service manual. I didn't have the 3/8" steel specified so I used 1/4" and a pair of buttresses instead of the welded pieces on the "C" end. I figured the buttress approach would prevent the thinner-than-spec'd steel plate from bending in the middle under load and it would also allow much more reliable support given my crappy welding skills. I've still got a bunch of cleanup to do but I think I'm going to test it by installing it and letting it sit with the car jacked up over the weekend. Eventually I want to paint it flourescent orange to help me see it so I remember to remove it before I drive the car.