Gray-B-Gon wind-powered evapotron for graywater disposal

Step 20 Make the pulley wheel: next step depends on hub type

Materials:

• one rear bike wheel and one extra axle nut or a quick-release skewer and nut.

Choose step 21 or 22 according to the type of hub: threaded (on left in picture) or freehub (on right).  If you have a choice, the freehub assembly is easier; the threaded hub requires more time and effort, as well as glue.