Konova just announced the availability of their Manual Crank upgrade kit for Konova Sliders. This should work with the smaller K3 and larger K5 sliders assuming you have the new version adjustable legs. If you have an earlier version Konova slider, there is an upgrade kit available for the new legs. Check out the Konova slider and upgrade kits on their website (click here).
Konova Crank Pulley, Konova kit, Konova slider, Konova Upgrade
Konova Slider Manual Crank System Upgrade Kit