How to outfit your dome for cheap:
Yes, the polycarbonate dome is expensive. But the hardware isn’t so much if you assemble it yourself rather than buying the yurt company package.
Below you see the set up:
Springs for 3 positions
This spring is opposite where the dome opens to let air in. It is attached to the dome with a stopper made of rubber to prevent damage to the relitively fragile dome. It is attached on the wood with a small hook.
The next two spring poitions are like the one below, each located about a 1/4 turn from the screwjack opening. The set up is the same as above but with two stiffer springs (we have two short ones rather than one long just because those are the ones we picked up at a garage sale)
Crank handle: the tool that enables you to turn to open the skylight dome from the ground position. The crank handle combined with some kind of extender, be it a broom handle or a stick with a hook on the end, is what allows you to reach the screwjack device which when turns will open or closr the dome. Jed fashioned a straightened election sign rod. He curled the end into a hook so it can hooked on or off.