Coaxial Chinese windlass

The mechanism is inspired by the Chinese windlass and the mechanism numbered as 490 of the book “507 Mechanical Movements”.
The gray pulley block consists of pink and orange pulleys fixed together.
One end of the black cable is fixed to the orange pulley.
The other end is fixed to the pink pulley.
The cable is wrapped several revolutions around the orange pulley, then goes around the blue, violet, other blue pulleys and is wrapped several revolutions around the pink pulley.
Dp, Do are the diameters of the pink and orange pulleys respectively.
h is the displacement of the weight in one revolution of the grey handle.
A is the angle between two branches of the violet pulley.
Approximately h = (Pi/2)*cos(A/2)*(Dp-Do)
If the difference between Dp and Do is small, the mechanical advantage of the windlass can be very large.
In this video: Dp = 124 mm; Do = 104 mm; h is smaller than 31.42 mm.
The mechanism works as if it is a screw-nut drive.

STEP files of this video:
http://www.mediafire.com/file/bh50pqxys6r9hwd/CoaxialChineseWindlassSTEP.zip/file
Inventor files of this video:
http://www.mediafire.com/file/608tfvu74e7tqxi/CoaxialChineseWindlassInv.zip/file

Видео Coaxial Chinese windlass канала thang010146