OK, I'm sure I've reinvented the wheel(s). I have no experience with multiple bends. in EMT. I needed to make an "offset bend" in some 3/4" EMT. First bend is no problem. However, the second must be bent so there is no "dog leg". From the YouTube videos, the electrician just sights down the hicky and crosses his fingers. I thought there must be a way to accurately mark a center line on opposite sides (180°) of the EMT. Mount an Ultra Fine Sharpy in a block at half the O.D. of the EMT and slide it along both sides. Since all parts of the Sharpy body are tapered it would be a little difficult to get it level in a block. So...Wheels! Nylon disks with an O.D. of the EMT and center holes that interference fit on each end of the Sharpy. Mark a line on each side of the EMT. Align one line for the first bend, and bend. Then align the opposite side's line for the second bend. and bend.
Ken
Ken