The case of the missing screw jacks

I began setting up the scaffolding this weekend, assembling the first course of a three unit high sctructure, with two sections on each side of the house, and two in front on either side of the front stoop. I was originally just going to put up the two sides, but with all the excess frames I had, I thought I might as well encase the front of the house in a big C shape, adding to the stability of the overall structure.

The cross brases went in very easily, but I only had three base screw jacks. The last owner mentioned he only used three, but I suspect he wasn't using all the sets at the same time. And after looking at the first course, that was tilted this way and that, there is no way this will be stable at 20' with three courses. I'd need thirteen more jacks (as well as the need to cut some 12"x12" plywood base platforms) to complete the structure!

This morning I ordered thirteen for $12.50 a piece, from a company out of Grand Rapids , MI. They'll be here Thursday; a small delay but a large savings. (The local scaffolding place, Berg, wanted $30 each - Pirates!)