Well, I was going to say search for it, but I could not find it either.
OK - two saw horses, one has a provision to hold the spar in either of two positions, with a slot for one and pad for other. The second end uses a length of PVC pipe inserted in the rib holes and is padded to prevent damage.
This is what I remember as the most clever and low capital/time investment.
Maybe add link if found.
Good Luck!