VEVOR Manual Winch Stacker, 9.4" - 72" Height Range, 19.7" Length x 15.7" Width Platform, Steel Lite Load Lift Winch, Hand Winch Lift Truck, 331 lbs Capacity Material Lift for Shipping Facilities

Is there a hidden "internal" pulley that the lift strap follows to allow for the increased lifting power? for example it takes twice the rope length to get the greater lifting power or is all done with the crank gear. A top view of the unit would answer that question. Otherwise, I can't get the math to work out. If there is no internal pully, it should only be able to lift about 100lbs.

I have to lower (winch down) an electrical assembly and winch up another one for installation. Will this VEVOR Manual Winch Stacker also be suitable for winching down the load? Can I use it to winch down as well as winch up with ratchet control or some other way of making sure a heavy load does not fall to the ground?