I just added to my web site a sketch of the jig I just designed to temporarily hold a 9' 2by4 at ceiling level. I will also use it to hold up 4 foot fluorescent light fixtures while I install them (I'm a one-man show). The actual height of my ceiling is about 93", but that may be immaterial.
I am considering (1) nailing a small 3.5" square piece of 2by4 on each side of the bottom of the vertical stud and then a 10" piece of 2by4 across these 2 squares, boxing the vertical stud in. This may be slight overkill, but hey, I have a reputation to maintain.
I was also (2) considering a foot long length of 2by4 with 45 degree angle cut on each end positioned diagonally between the base and the vertical stud. My concern here was not whether this was a good idea, but that a nail through the "top" of a 45 degree end was likely to split it...
Just thought I'd see what people who know think.
By the way, I also submit this as another example of sketching with SketchUp for folks who are still wondering whether it is really useful or not. Note how I was able to add "notes" off to the side--which are as easily maintainable as on an editable document... Not only that, I could just print it out and mail it to the patent office...LOL! : )
Bill