how to make geothermal slinkies and how to get an extra 100 feet of heat exchange

I wanted to share how to keep the loops from kinking as you make them, show you some tips for making a better slinky work table, and tell you how to get an extra hundred feet of free heat exchange out of each loop by not mixing your outgoing loop with your return loop. Seriously, why would anyone tie the outgoing pipe directly to the return loops? It's just plane silly to mix your hot and cold like that. Instead put the slinky return loops in the trench first and bury them in several feet of dirt, and then bring the out-flowing line to the house on top of that so you have a couple feet of dirt insulation. Then fill the rest of the trench. Water flows out the upper straight portion of pipe to the end of the trench and then to the deeper slinky loops for the trip back to the house. Also there is much ignored middle ground between the really long 300' straight line trenches and 66' trenches with 3' loops overlapping every 18'. I have opted to not overlap loops, just putting 3' loops side by side in 100' trenches. It gets me 50% more surface area for heat exchange and I just have to dig an extra 34'.