Note: the balm is a 4:1 and the wire and rope are connected with an insulator. The max sheave size is about 2" on the pulleys.
This design is not mine, but is the brain child of Joe Maughan (AA7J). We tried it with old battery powered drills to work as the wenches and change the lengths from the shack. However they are not very weather proof. So in the end we went back to the hand wenches.