Nursery Seed Starting Soil Sifting Tool

I've made many make-shift soil sifting tools out of random objects just to get the job done, however with this soil sifting tool I had a whole new experience. Typically if I made some kind of a sifting device, it would just be a screen mesh sheet stapled, nailed, or sandwiched between a wood frame. With the mesh sheet type of sifter, you have to shake the whole frame around, drag the materials around with your hands and basically do a lot of chaotic work to get the process to function. However with this elegant design of a sort of spiraling sifting device, the economy of motion and energy is such that not only is it very ergonomic, it's very efficient.

Similar to a coffee grinder where the beans get funneled to a smaller point where the grinding action takes place, with this sifter, rather than grinding the material, it simply uses gravity and the force of hand crank spinning to push the fine particles down and through, leaving all the bulkier sizes above.

It can't be over-emphasized the value of very fine grain seed starting mixes, while most seeds seem to do okay with relatively course grains, I almost always get better results the finer the grain, hence the need for a good way for sifting through the various ingredients that are often mixed in.

I'd like experiment with designing a make-shift spiral hand crank sifting tool, if I ever do, you'll see it here first!