Just found this great site. Didn't see any threads on this helpfull tip,trick. I was on a job that had baseray heat around the entire room. Was installing a thick tight plush and couldnt brace my powerstretcher on any wall. I got a 2x6 that was 4' long out of the customers garage. I nailed 3 pieces of arc. tackless to it, turned it upside down so tack was on the rug with pins leaning away from the head, had my helper stand on the board a foot away from the wall and used that as my brace for my foot of stretcher. I am sure most of the old timers have used this, but if not it could save your day.
I used my deadman to stretch to a double doorway, of existing carpet, on a concrete stretch job. I simply turned the deadman around and put it in front of my power-stretcher. Now I was stretching 4' of rug at one push. I cranked the stretch, did the seam, and let it cool. (off topic, the term "jacking off the wall" refers to power stretching, doesn't it?)