Watching Norm build a shed on TV, he had a gadget I hadn't seen before.
Steel bar around 2' long. Attached to this about 6" from the base was a right angle steel bar - so the whole thing looked like a lower case "h". Both bars had points at the bottom & it pivoted where the right angled piece met the straight piece.
When fixing a side of the shed the straight piece was tapped into the floor & the angled bit tapped into the bottom of the wall section. Pulling back on the straight bar pulled the two together.
Any idea what such a gadget is called?