For my current measurement job, I need to create 4 large radial turns: 2 with a 75' radius and 2 with with a 25' radius. I'm planning to use double loop chain like this that is pre-measured and cut to length. The radial point end of the chain will swivel on a spike. I'll have an assistant hold the spike and ensuring it rotates freely while I walk the turn and place markers every 4' apart. See attachment for diagram.
Any veteran measurers here have any better ideas or suggestions for creating these?