Here's a look at the Varavon Slider Crank Handle Upgrade Kit. The idea for a crank pulley is to keep your shaky hands away from the camera, but whether it produces smoother results are based on the experience of the operator. A fully motorized slider will always yield the most consistent results, but in times where battery power or noise is an issue, the Crank Handle kit is another option.
The Varavon Crank Handle Kit comes with two end pieces that can fit most sliders on the market so long as you have a 1/4" or 3/8" mounting point on either side. A metal plate sits under your tripod head on the carrier, and a pulley belt can be cut to size. The handle length can be adjusted for longer or shorter crank rotations. The Varavon Crank Handle Kit for Sliders are available via eBay (click here).